my hypothesis is that If you drop a piece of buttered toast, it will land butter side down.
I tested it by dropping 10 pieces of buttered toast off the table and noted on which side it landed
It could be falsified cause I just made all of this up. In essence, it's like flipping a coin, 50/50 chance so I could say that 5 landed butter up and 5 landed butter down.
A scientific hypothesis, such as 'Plant growth is positively affected by the presence of light', must be testable and falsifiable. It is tested and potentially falsified through controlled experiments, where one group is exposed to the variable under question while the other is not. Science advances by testing and potentially disproving such hypotheses, never claiming absolute proof.
Example of a Scientific Hypothesis and Testing
A scientific hypothesis is a proposed explanation for a phenomenon that is testable and falsifiable. An example of a hypothesis could be: 'Plant growth is positively affected by the presence of light'. To test this hypothesis, you could conduct an experiment with two groups of plants: one group, the experimental group, would be exposed to light, while the control group would not. Plant growth can be measured over a period to determine the effect of light. The hypothesis would be falsified if the plants in darkness grew as well or better than the plants exposed to light.
Falsifiability
Falsifiability is a core principle in science, ensuring that hypotheses can be disproven. A non-falsifiable hypothesis, such as 'Red is a better color than blue', cannot be tested or disproven, and thus is not scientific. Falsifiable hypotheses contribute to the scientific method by ensuring that they can be subject to empirical testing. If ongoing tests and experiments consistently fail to disprove a hypothesis, it gains support as a valid explanation until potentially falsified by future research.
Why can we never prove that a hypothesis is true?
Scientific hypotheses cannot be proven to be true but can be strongly supported by evidence.
Hypotheses in science cannot be proven to be true with absolute certainty because scientific knowledge is always subject to revision and refinement based on new evidence. However, we can provide strong evidence supporting a hypothesis through experimentation and observation. Scientific theories are formed when a hypothesis has been extensively tested and supported by a large body of evidence. Such theories serve as the most accurate explanations for natural phenomena and are considered to be highly reliable.
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98 POINTS PLEASE HELP What can a transistor do in order to fulfill its function in a circuit? Check all that apply.
control which layer is the emitter
control its own semiconductance
change the dopants in the transistor
act like an insulator
act like a conductor
control which layer is the emitter and change the dopants in the transistor are fixed in a transistor and cannot be changed or controlled.
transistor is made of silicon which is a semiconductor. it consists of two diodes which can act as a conductor and insulator. so the answer is:
- control its own semiconductance
- act like an insulator
- act like a conductor
Final answer:
A transistor in a circuit can act like a conductor when the base is forward-biased, allowing current to flow. It can also act like an insulator when the base is reverse-biased, preventing current flow. The characteristics of a transistor such as dopant levels and emitter layer are fixed during manufacturing and are not changeable during operation.
Explanation:
A transistor is a semiconductor device used to amplify or switch electronic signals. A typical junction transistor consists of three parts: the emitter, the base, and the collector. The transistor can control its own semiconductor and act like a conductor or an insulator. Here's what a transistor can do in a circuit:
Act like a conductor: When the base is forward-biased, it allows current to flow through the transistor, essentially conducting the electricity.Act like an insulator: When the base is reverse-biased or not biased at all, the transistor prevents current flow, insulating the circuit.It doesn't change the dopants in the transistor or control which layer is the emitter, as these characteristics are determined during the manufacturing of the transistor and are not changeable in operation.
Transistors are essential components in integrated circuits (ICs) and are found in nearly all modern electronic devices. They are the basis of digital circuits that use binary code for processing information.
What colours result from mixing green and blue light?
Overall, what is the least useful mineral identification property listed here?
A. Streak
B. Hardness
C. Magnetism
D. Specific gravity
C. Magnetism
Very few minerals are magnetic, while streak hardness and specific gravity can be used to identify lots of minerals
Water in the oceans, rivers, and lakes turns to water vapor. This process is called ___________ and requires heat energy from the Sun.
The driver of a car moving with a constant speed applys the brakes and the car comes to a stop after 3.5 meters. Which force causes the deceleration of the car?
friction ... brake pads to road wheels
Which reaction would result in a change in odor, indicating a chemical change has occurred?
odour = gas suggesting molecular rearrangement ... chem change
A change in odor can indicate a chemical change has occurred. Examples include the oxidation of iron in myoglobin when cooking red meat and a banana turning brown.
Explanation:A change in odor can indicate a chemical change has occurred. Examples of reactions that result in a change in odor include the oxidation of iron in myoglobin when cooking red meat, which causes a red-to-brown color change and change in smell. Another example is a banana turning brown, where new, darker substances form and the odor changes. These changes in odor are indicators that chemical reactions have taken place.
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Which is a nonrenewable resource for the production of nuclear energy?
A.coal
B.natural gas
C.geothermal
D.uranium
D. Uranium
Hope this helps :)
Answer:
It is Uranium.
Option (D)
Explanation:
Uranium is a radioactive substance.
When uranium is bombarded with neutrons it emits very large amount of energy along with some stable substances. The energy emitted s called nuclear energy.
The reaction is given by
~*~WILL GIVE BRAINLIST~*~
What is the velocity in meters per second of a runner who runs exactly 110 m toward the beach in 72 seconds.
A) 0.654 m/s toward the beach
B) 1.53 m/s toward the beach
C) 15.3 m/s toward the beach
D) 7920 m/s toward the beach
Your answer is B. 1.53 m/s towards the beach.
110/72 = 1.52777 and then you round it to 1.53 :)
Help needed
A volcanic eruption adds carbon dioxide to the air. This is an example of interactions between the
1)
atmosphere and geosphere
2)
geosphere and biosphere
3)
hydrosphere and biosphere
4)
hydrosphere and geosphere
Answer: Atmosphere and geosphere.
Geo-sphere is the solid part of the earth. Hydrosphere is the water part. The living things on the earth make up the biosphere. The gases, water vapors etc make up the atmosphere. When a volcanic eruption adds carbon dioxide to the air, the carbon-dioxide is being added from geosphere to the atmosphere. Hence, there is interaction between atmosphere and geosphere.
CD bisects AB at point G. If AE = BE, which equation must be true?
A.
BE = BG
B.
AE = 2(BG)
C.
AE = BG
D.
AG = BG
E.
none of these
Answer: The correct answer is option D.
Explanation:
It is given that line CD is bisecting the side AB in triangle ABE
and AE = BE
Bisecting a line segment means that diving a line segment into two equal parts. So, when CD bisects side AB at point G it means that:
AG = BG
Hence, the correct answer is option D.
CD bisects AB at point G. If AE = BE, this equation must be true is D.AG = BG.
What is the work of the bisector?Bisector cuts something in 1/2 of. An attitude bisector is a line that cuts a given attitude in 1/2 of. The perpendicular bisector of a line phase is the road that cuts the given phase in 1/2 of and is at proper angles to it.It is for this reason that line CD is bisecting the facet AB in triangle ABE.
Bisecting a line phase method that diving a line phase into same parts. So, whilst CD bisects facet AB at factor G it method that:AG = BG.and AE = BG
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two forces are acting on a wheelbarrow. One force is pushing to the right and an equal force is pushing to the left. What can you say about the wheelbarrow's movement? A) it is slowing down. eliminate b) it is not accelerating. c) it is moving faster and faster.. d) its speed is changing at a constant rate.
A 3kg box is pulled along the floor with a force of P=20 N at an angle of 30 degrees. If the box is moving at a constant velocity, calculate the force of friction f, the normal force N and the weight W.
If force is applied at 30 degree with the horizontal
then first we will find the components of force in two directions
[tex]F_x = 20 cos20[/tex]
[tex]F_y = 20 sin30[/tex]
now we can find normal force by balancing the forces in Y direction
[tex]F_n + Fy = mg[/tex]
[tex]F_n + 20 sin30 = 3*10[/tex]
[tex]F_n + 10 = 30[/tex]
[tex]F_n = 20 N[/tex]
now since block is moving with constant speed
so here forces along horizontal plane will be balanced also
[tex]F_x = F_f[/tex]
[tex]F_f = 20 cos30[/tex]
[tex]F_f = 17.3 N[/tex]
Now the weight of the box is defined as
[tex]W = mg[/tex]
now plug in all values
[tex]W = 3*10 = 30 N[/tex]
If an object is said to be moving at 10m/s due north. The measurement 10 m/s would be best described as
The answer is velocity
Answer: Speed.
Explanation :
It is given that if an object is said to be moving at 10 m/s due north. In this case, the velocity of an object is given. It has both magnitude and direction as well.
Velocity is a vector quantity. 10 m/s is the magnitude of velocity and it is moving towards the north direction.
We know that the sped of an object is the total distance covered divided by the total time is taken. It is a scalar quantity.
So, 10 m/s shows the speed of an object.
If an object is dropped from a tall building and hits the ground 3.0 s. later, what is the magnitude of the object's displacement in 1.0 s.; in 2.0 s.?
1.0 s. =
m
2.0 s. =
m
Find the velocity of the object after one second.
v = vo + at
v = (0 m/s) + (9.8 m/s^2)(1 s)
v = 9.8 m/s
Now, using that, you can find the displacement in that one second between 1 and 2.
d = vot + (1/2)at^2
d = (9.8 m/s)(1 s) + (1/2)(9.8 m/s^2)(1 s)^2
d = 14.7 m
Answer: In 1.0 s , Displacement = 4.9 m
In 2.0 s, Displacement = 19.6 m
Explanation: Using formula for equation of motion
[tex]h=u\times t + \frac{1}{2}\times g\times t^{^{2}}[/tex]
Initially , u= 0 m/s , t= 1.0 s and g=9.8 [tex]\frac{m}{s^{2}}[/tex]
Therefore [tex]h_1= 0 + \frac{1}{2}\times 9.8\times 1^{2} m = 4.9 m[/tex]
In Case t=2.0 s
[tex]h_2= 0 + \frac{1}{2}\times 9.8\times 2^{2} m = 19.6 m[/tex]
Select the correct answer.
What did the observation of the spectrum of different galaxies reveal?
A.
there were more galaxies whose spectrum was blueshifted
B.
there were no galaxies whose spectrum was redshifted
C.
there were more galaxies whose spectrum was redshifted
D.
there were no galaxies whose spectrum was blueshifted
Historically, the correct choice is C.
PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!
Which is a standard metric base unit, correctly matched with what it measures?
A) Kelvin: time
B) second: time
C) meter: volume
D) gram: temperature
Ok srry bout last time but the answer is A) kelvin: time the reason is because everything else is a SI. Hope this helps and TURTLE
Which of the following must be true about an object for it to be in uniform circular motion? A.It must have zero centripetal acceleration. B, It must have increasing centripetal acceleration. c. It must be moving at a constant speed. D. It must be moving with a constant velocity.
Answer:
It must be moving at a constant speed
Explanation:
When an object move in a circular path, its motion is called uniform circular motion. The object moves with constant speed but the direction always changes. We know that the rate of change of velocity is called acceleration of the object.
In circular motion, the centripetal acceleration act towards the center of circle. The force acting on the object is called centripetal force. It is given by :
[tex]F_c=\dfrac{mv^2}{r}[/tex]
Hence, the statement that is true about an object to be in uniform circular motion is (C) " It must be moving at a constant speed".
The following must be true about an object for it to be in uniform circular motion C. It must be moving at a constant speed.
What happens in uniform circular motionIn uniform circular motion, an object travels in a circular path at a constant speed, but its velocity is not constant because the direction of the velocity is constantly changing.
The centripetal acceleration is directed toward the center of the circle and is responsible for keeping the object in its circular path, but the object's speed remains unchanged.
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When the speed of electrons striking the anode of an x-ray tube increases, the _____ of the emitted x-rays increases.
Final answer:
When the speed of electrons striking the anode of an x-ray tube increases, the energy of the emitted x-rays increases.
Explanation:
This happens because as electron speed (and consequently their kinetic energy) increases, upon interacting with the anode material, they are decelerated and their kinetic energy is converted into electromagnetic energy in the form of x-rays.
The relationship between accelerating voltage and the maximum x-ray energy is given by the equation Emax = h fmax = qe V, where h is Planck's constant, fmax is the maximum frequency, qe is the charge of an electron, and V is the accelerating voltage.
As the filament voltage increases, which accelerates the electrons towards the anode, the emitted x-rays have higher energy, and therefore a higher frequency.
The diagram shows the electric field in the vicinity of a charge.
At which point is the electric field strongest?
A) W
B) X
C) Y
D) Z
C) Y is the strongest point in the electric field.
Answer: At Y electric field is strongest.
Explanation :
The space around a charged particle in which the effect of the electric force is experienced is called electric field.
The electric field lines are the imaginary lines. The field lines for the positive charge is outwards and for negative charge, it is inwards.
The field lines are strongest at the point where the field lines are compact or very close.
In this case, the electric field is strongest at point Y.
Hence, the correct option is (c) " point Y ".
0.8 mj of energy are used by a blender in 3 and a half minutes what is the power rating on the blender
Answer:
Power rating on the blender = 3809.52 Watts
Explanation:
We have expression for power equal to ratio of work and time,
Energy used by blender = Work done by electricity = 0.8 MJ = [tex]0.8*10^6J=800000J[/tex]
Time of using blender = 3.5 minutes = 210 seconds
So power of blender = 800000/210 = 3809.52 Watts
Power rating on the blender = 3809.52 Watts
Which is a part of interphase? A. S phase B. Anaphase C. Telophase D. Cytokinesis
The answer choice that is a part of the interphase is A. S phase.
What is Interphase?Interphase is the stage of the cell cycle that prepares the cell for division and is divided into three phases: G1, S, and G2.
During the S phase (synthesis phase), DNA replication occurs, meaning the cell's genetic material is duplicated in preparation for cell division.
Hence, it can be noted that the other answer choices are not a part of interphase as the S phase is the synthesis phase that helps prepare the cell for division
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Final answer:
The part of interphase related to chromosome duplication is the S phase. Interphase, which includes the S phase, is separate from mitotic stages like anaphase and telophase and the cell division process of cytokinesis.
Explanation:
The part of interphase that involves the replication of DNA is known as the S phase. Therefore, the answer is A. S phase. Interphase consists of three main stages in the cell cycle: the G1 phase, S phase (synthesis phase), and G2 phase. During the S phase, the chromosomes are duplicated, ensuring that each new cell will have a complete set of chromosomes after cell division.
Interphase is distinct from the stages of mitosis, which include prophase, metaphase, anaphase, and telophase. Finally, cytokinesis is the process where the cytoplasm divides, forming two separate cells.
In contrast to interphase, anaphase is a stage of mitosis where sister chromatids are separated and pulled to opposite poles of the cell. Telophase is the stage when the chromosomes begin to decondense, and new nuclear envelopes start to form around the daughter nuclei. Cytokinesis, while often occurring concurrently with telophase, is considered a separate process from mitosis and is not part of interphase.
Describe the difference between continuous reinforcement and intermittent reinforcement.
(psychology)
A continued schedule of reinforcement (CRF) happens when reinforcement is delivered after each and ever single targeted behavior
While a intermittented schedule of reinforcement (INT) is when reinforcement is delivered after only a few behaviors or responses not after each and every single one
Continuous reinforcement and intermittent reinforcement differ as follows:
In continuous reinforcement, each and every emission of the target behavior always receives reinforcement.
That is, each time the desired or studied behavior is carried out, it will result in the arrival of the reinforcer.
In the case of intermittent or partial reinforcement, only some of the times that the behavior is carried out is a reinforcer received, so that not every time we do the behavior we will get a reward.
Therefore, we can conclude that in intermittent reinforcement the behavior of the person is only reinforced on certain occasions and in continuous reinforcement the person is constantly rewarded for an action or behavior.
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To determine the speed of a wave, you would use which of the following formulas?
a. speed = frequency x amplitude
b. speed = wavelength x frequency
c. speed = wavelength x amplitude
d. speed = wavelength x period User: Which part of the ear amplifies the vibrations from sound waves?
A. outer ear
B. inner ear
C. middle ear
D. both a and b
Explanation :
(a) The distance between two consecutive crests or troughs is called wavelength of a wave. It is denoted by [tex]\lambda[/tex]
The number of vibrations produced per second is called its frequency. It is denoted by [tex]\nu[/tex].
We know that the distance covered per unit time is called the speed of the wave i.e.
[tex]s=\dfrac{d}{t}[/tex]
The distance covered by the wave is [tex]\lambda[/tex]. So,
[tex]s=\dfrac{\lambda}{T}[/tex]
We know that T is the time period of the wave and the relation between the frequency and the time period is [tex]\nu=\dfrac{1}{T}[/tex]
So, [tex]speed=wavelength\times frequency[/tex]
So, the correct option is (b).
(b) Human ear consists of the outer ear, middle ear, and inner ear.
Middle ear amplifies the vibrations from the sound waves. It consists of three bones namely hammer, anvil and stirrup. The amplification of sound waves takes place many times by these bones.
So, the correct option is (c).
To win the game, a place kicker must kick a
football from a point 28 m (30.6208 yd) from
the goal, and the ball must clear the crossbar,
which is 3.05 m high. When kicked, the ball
leaves the ground with a speed of 18 m/s at
an angle of 48◦
from the horizontal.
The acceleration of gravity is 9.8 m/s
2
.
By how much vertical distance does the ball
clear the crossbar?
Answer in units of m.
v = 18cos48 m/s
So time = distance/speed
= 28/18cos48
= 2.3247413
Resolving vertically, now use s = ut + (0.5)a(t^2)
Where s is the unknown distance (the height above the GROUND)
u is initial (vertical) speed = 18sin48
a = -9.8 m/s (negative since we take upwards as positive)
t = 2.3247... (what we found previously)
Putting the numbers into the formula gives 4.616126809
Take away the height of the goalpost (3.05) = 1.566126809
= 1.57m above the crossbar.
hope this helps :)
We have that the vertical distance the ball clear the crossbar is
x=1.795
From the question we are told
To win the game, a place kicker must kick a football from a point 28 m (30.6208 yd) from the goal, the ball must clear the crossbar, which is 3.05 m highthe ball leaves the ground with a speed of 18 m/s at an angle of 48◦The acceleration of gravity is 9.8 m/sGenerally the equation for the t is mathematically given as
[tex]t=\frac{d}{vcos\theta}\\\\t=\frac{28}{18cos48}\\\\t=2.3sec[/tex]
Generally the Newtons equation for the distance is mathematically given as
[tex]s=uyt+1/2at^2\\\\s=18sin48*(2.3)-\frac{9.8}{2}*(2.3)^2\\\\s=4.845[/tex]
Therefore
The Distance clear will be
[tex]x=s-3.05\\\\x=4.845-3.05[/tex]
x=1.795
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An area where the particles in a medium are spaced close together is called a _____.
An area where the particles in a medium are spaced close together is called compression.
Answer : Compression
Explanation :
An area where the particles in a medium are spaced close together is called a compression. In this region the particles are very close to each other.
In the attached figure, the rarefaction and compression is shown very clearly. In rarefaction, the particles of medium are very far apart form each other.
The distance between two consecutive compression and rarefaction is called the wavelength of wave.
So, the compression is the area where the particles are close to each other.
Part a a box is being pulled to the right over a rough surface. t > fk , so the box is speeding up. suddenly the rope breaks. what happens? the box a box is being pulled to the right over a rough surface. t > , so the box is speeding up. suddenly the rope breaks. what happens? the box keeps its speed for a short while, then slows and stops. slows steadily until it stops. stops immediately. continues speeding up for a short while, then slows and stops. continues with the speed it had when the rope broke.
The box slows steadily until it stops.
Let us understand why this should be the case.
We know that the Tension Force in the rope is greater than Friction and hence is responsible for accelerating the box.
As soon as the rope breaks, the Tension Force becomes 0 and the box is left with only the Friction acting on it.
Since the friction takes over immediately, the box begins to slow down at a steady pace until it stops completely.
Following the breaking of the rope, the box continues with the speed it had at that moment. The box then slows down due to the unopposed force of friction and eventually halts.
Explanation:In the given scenario, a box is pulled to the right over a rough surface with a force t that is greater than the friction force f.k. This indicates that the box is accelerating to the right. When the rope breaks, the force t acting on the box suddenly becomes zero. However, the force of friction f.k still acts on it. This force f.k, previously balanced by t, now unopposed, slows the box down by acting opposite to its direction of motion. Therefore, the box continues with the velocity it had when the rope broke, slows down steadily due to friction until it eventually stops.
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The table lists the mass and charge of a proton and a neutron.
How do the gravitational and electrical forces between a proton and a neutron compare?
A) The gravitational force is much smaller than the electrical force for any distance between the particles.
B) The gravitational force is much larger than the electrical force for any distance between the particles.
C) The gravitational force is much smaller than the electrical force for only very small distances between the particles.
D) The gravitational force is much larger than the electrical force for only very small distances between the particles.
B. The gravitational force is much larger than the electrical force for any distance between the particles.
The gravitational force is much larger than the electrical force for any distance between the particles. Then the correct option is B.
What is Columb's law?The force of attraction between two charges, according to Coulomb's law, is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
The electrical force between the masses,
[tex]\rm F_e = k\dfrac{q_pq_n}{r^2} \\\\\ F_e= 9 \times 10^ 9 \times \dfrac{1.61 \times 10^{-19} \times 0 }{r^2} \\\\ F_e = 0 \ N[/tex]
The gravitational force between the masses is,
[tex]\rm F_g = G \dfrac{m_pm_n}{r^2} \\\\ F_g = 6.67 \times 10^{-34}\times \dfrac{1.673 \times 1.675 }{r^2} \\\\ F_g =\dfrac{ 1.869 \times 10^{-33}}{r^2} \ N[/tex]
From the above calculation, observed that the gravitational force is much larger than the electrical force for any distance between the particles.
Hence the correct option is B.
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HURRY PZZ 30PTS
Which of the following characteristics differentiates an autotroph from a heterotroph? Question 1 options: An autotroph can only obtain its energy from a heterotroph. An autotroph must obtain its energy from a heterotroph or other autotroph.. Heterotrophs only obtain their energy from the Sun. A heterotroph must obtain its energy from an autotroph or other heterotroph. Autotrophs only obtain their energy from the Sun. A heterotroph can only obtain its energy from an autotroph.
If someone told you they had a career in either ecology, paleontology, or botany, what area of science is this?
Question 2 options:
astronomy
biology
physics
chemistry
Which of the following statements is true for all living things (organisms)?
Question 3 options:
None of The Above
All living things are made up of one or more cells.
All living things have organs.
All living things produce their own food.
How are these related: human, mold, bacteria?
Question 4 options:
They are all protists.
They are all organisms.
They are all Domain Bacteria.
They are all Kingdom Animalia.
What would happen if several salmon in an area were only able to lay 100 eggs instead of what they normally lay?
Question 5 options:
Nothing. The population will most likely stay the same.
The population will most likely die out since most of the eggs are usually eaten and destroyed.
The population will most likely decrease some but the salmon will still survive in the area.
The population will most likely increase dramatically since fewer eggs means better eggs
An organism that has been thriving, has died. Which of the following is NOT a cause of its demise?
Question 6 options:
appropriate enviornment
soil
food
water
The leaves on a green plant soak up sunlight to make food. A cow's stomach digests grass that was eaten. How are these alike?
Question 7 options:
They are both show how organisms continue growth.
They both show how organisms use metabolism.
They are both examples of heredity in organisms.
They are both ways organisms maintain homeostasis.
While exercising, the body releases sweat. Which of the below is a reason this occurs?
Question 8 options:
None of the Above
Homeostasis
Metabolism
Survival of the fittest
Based on the classification system, which subgroup would you find at the bottom?
Question 9 options:
Class
Phylum
Domain
Species
You are taking a walk in the woods. You come upon a butterfly with coloring and other features you have not seen before. You want to find out its scientific name so you can tell your friends and family about it, and they can look it up. It would be best to use what to determine this?
Question 10 options:
Classification system
dichotomus key
Google
science book
Who developed a system of classifying organisms by genus and species?
Question 11 options:
Watson
Mendel
Linnaeus
Darwin
Autrotrophs obtain their energy from the sun
Biology
All living things have. Organs
Answer:
Q1: A heterotroph can obtain its energy by consuming another autotroph or a heterotroph.
Q2: Biology.
Q3: All living things are made up of one or more cells.
Q4: They are all organisms.
Q5: The population will most likely die out since most of the eggs are usually eaten and destroyed.
Q6: Appropriate environment.
Q7: They are both ways organisms maintain homeostasis.
Q8: Homeostasis.
Q9: Species
Q10: Dichotomous key.
Q11: Carolus Linnaeus
True or false: the energy that is related to moving parts is called electrical energy
False, that would be kinetic energy.