Answers
The correct answer is option C, Scientific theories are often modified , but they are not usually discarded
Democritius claimed that atom is made of simple parts (400 BC)
Joseph Thompson in 1897, discovered electrons. He didn't violated the facts of Democritius but just strengthened the facts with further discovery.
While in the next stage Neil's Bohr, Further strengthened the fact of of Thompson by clearly defining the placement of electron and proton.
Related Questions
Which condition can cause a population crash?
Answers
When the number of individuals within a group or population or species suddenly decline it is termed as population crash. This term is often referred when the human population declines suddenly impacting the economy and the quality of life.
The causes of population crash includes competition for the environmental resources required for survival is under scarcity and this implies only the fittest can survive according to the Darwin’s theory. The other major reason can be any natural disaster like floods, droughts, earthquake, volcanic eruption, fire, incidence of some disease or epidemic condition.
Cross a heterozygous running, heterozygous Black mouse
Answers
The association of three or more states created for mutual benefit and the achievement of shared objectives is ____. A) environmentalism B) nationalism C) regionalism D) supranationalism
Answers
in this type of multinational political union a large amount of power given to an authority which in theory is placed higher than the state.
In Europe the authority is the European Union.
I only have 10 points, so.. Sorry.
1. The colors of an opaque object are the result of:
refracted light
reflected light
the light transmitted
2. Sounds which we hear are the result of vibrations
True
False
3. In the English system, force is measured as:
ft.
lbs.
ft.-lbs.
ft.-lbs./sec.
4. A force of 2,500 pounds drags a truck 30 feet in 1/2 minute.
How much work is accomplished?
How much power was required?
Work = 75,000 ft-lbs, Power = 32, 5000 ft-lbs/sec
Work = 7,500 ft-lbs, Power = 250 ft-lbs/sec
Work= 75,000 ft-lbs, Power = 2,500 ft-lbs/sec
5. The resistance which opposes the motion of moving parts is called ___
inertia
friction
gravity
6. The "work principle" for real machines can be defined as, "The work accomplished by a machine will always be less than the work needed to operate the machine."
True
False
7. Mass and weight are essentially the same.
True
False
8. A single chemical which will not divide into any other simpler substance is:
an element
a compound
a molecule
9. What is "atomic number"?
a place in the Periodic Table
the number of atoms in a molecule
the number of protons in an atom
the number of units of atomic weight
10. The atomic weight of an atom is?
equal to the number of protons
equal to the number of neutrons
approximately the number of neutrons plus protons
an actual (real) weight of the atom
a relative weight
Answers
Opaque objects display colors via reflected light, sounds are due to vibrations, and force in the English system is measured in pounds. Work relates to force applied over a distance, differing from power which includes time factor; both factors govern machine operation. The atomic number represents proton count while atomic weight approximates neutron plus proton count.
The colors of an opaque object are the result of reflected light.
Sounds which we hear are the result of vibrations which is true.
In the English system, force is measured as lbs (pounds).
When a force of 2,500 pounds drags a truck 30 feet in 1/2 minute, the work accomplished is 75,000 ft-lbs (force x distance) and the power required is 2,500 ft-lbs/sec (work divided by time in seconds).
The resistance which opposes the motion of moving parts is called friction.
The "work principle" for real machines can be defined as, "The work accomplished by a machine will always be less than the work needed to operate the machine," which is true.
Mass and weight are not essentially the same. This statement is false.
A single chemical which will not divide into any other simpler substance is an element.
The "atomic number" is the number of protons in an atom.
The atomic weight of an atom is approximately the number of neutrons plus protons.
If the area of a circle measures 4π cm2, what is the circumference of the circle in terms of π?
Answers
Area = pi x radius squared
4 x pi = pi x radius squared
4 = radius squared
2 = radius
Now that we have the radius, we can plug it into our formula for circumference.
Circumference = pi x diameter (or 2 x radius)
Circumference = pi x 4
Circumference = 4[tex] \pi [/tex]
when studying heredity, what is the relationship between dna bases and traits
Answers
The relationship between DNA bases and traits is that, the nitrogen bases in DNA decide the traits on an organism. The traits differ with respect to the nucleotides.
What is heredity ?The study of heredity examines how qualities are conveyed from one generation to the next through sexual reproduction. Cells in offspring inherit their parents' genetic makeup.
The characteristics of an organism are determined by the placement of nitrogenous bases in DNA. Each triplet of three bases codes for a distinct amino acid.
The nucleotides that make up the mRNA are determined by the DNA bases (Adenine, Guanine, Cytosine, and Thymine), and the codons that determine which amino acids are coded by those codons are determined by the mRNA nucleotides.
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What are 3 effects of glaciation?
Answers
A group of science students have been learning how the human circulatory system reacts during exercise. The students measured their heart rates both before and after they ran five laps around the school gym. This was repeated two more times, with a 5-minute rest period between each trial. The average heart rates of the students are shown in the bar graph. State the general relationship between exercise and the heart rate in humans?
Answers
Exercise increases heart rate and cardiac output, which enhances the heart's efficiency and overall cardiovascular health.
Explanation:The general relationship between exercise and the heart rate in humans is that during exercise, the heart rate increases to supply more oxygen-rich blood to meet the demands of the working muscles. Cardiac output, which is the volume of blood the heart pumps per minute, also increases during exercise. The nonathlete's cardiac output can increase from about 5 liters per minute at rest to about 20 liters per minute during exercise, and well-trained athletes can reach over 30 liters per minute. Exercise enhances the heart's efficiency, evidenced by an increase in the heart's size and mass, which leads to a stronger heart that can pump more blood with each contraction (stroke volume), thus increasing cardiac output.
In summary, the relationship between exercise and heart function is an increase in heart rate and cardiac output, which is part of the body's natural adaptation to the increased physiological demands of exercise. This adaptation results in improved vascular homeostasis and overall cardiovascular health.
Consider the following chemical reaction,
O^2 + 2H^2 = 2H^20
What are the reactants?
What are the products?
How many molecules of H^2 are used in this reaction?
Sorry if this question doesn't make much sense... ;o;
Answers
2H^20
4
Each line is a different quetion.
Classification systems ?
Are all the same
Are all different
Vary with the taxonomists
None of these
Answers
Answer: Are all different
Explanation:
A classification system is a system of categorizing, organization and naming the organisms or entities in a proper order. The classification system varies according to different subjects, author and utility of classifying the subjects of classification. It is the basis of identification, and grouping of the organisms or entities. Thus all the classification systems are different.
During a chemical reaction, the amount of energy
A) may increase or decrease depending on the type of reaction
B) increases as it is converted from one form to another
C) decreases as it is converted from one form to another
D) is constant as it is converted from one form to another
Answers
A cup of water is left out overnight. In the morning, how will the temperature of the water compare to the temperature of the air in the room?
Answers
I Hope This Helped!
The temperature of the water would be the same as the temperature of the air in the room.
What is temperature?The physical concept of temperature indicates in the numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances.
Fahrenheit, Celsius, and Kelvin are the three scales that are most frequently used to measure temperature (K).
A thermometric property is one that is affected by temperature. Volume, pressure, electrical resistance, emf, and colour are a few examples. A thermometer can be created using one of these characteristics. In order to design a temperature scale that displays numbers, two fixed points are also required.
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_____ tissue covers the outer surface of herbaceous or soft-stemmed plants
Answers
Answer:
The correct answer would be dermal tissue.
Explanation:
The dermal tissue protects the soft tissues of herbaceous plants and soft-stemmed plants and regulates interactions with the surroundings of the plants.
It is a very thin layer that secretes a waxy layer called the cuticle that prevents water loss from the plants. It has stomata that help in the gaseous exchange of the atmosphere. It arises from the primary meristematic tissues.
Thus, the correct answer would be dermis tissue.
WILL GIVE BRAINLIEST TO RIGHT ANSWER.
What is the advantage of using the electromagnetic spectrum model?
A. It helps compare frequencies of light.
B. It helps change the wavelengths of light.
C. The color of light waves can be changed using the model.D. The intensities of light waves can be changed using the model.
Answers
Answer:
A it helps compare frequencies of light
Explanation:
Because the frequency of light will tell if the wavelength is longer or shorter.
Please give the brainiest
Answer:
The electromagnetic spectrum describes all the wavelengths of light.
Explanation:
What is the electromagnetic Spectrum model?
The scientists used the term electromagnetic spectrum to describe the entire range of light that exists in the universe. From gamma rays to radio waves, most of the light present in the universe is invisible to us.
The electromagnetic spectrum describes all the wavelengths of light. It explores an otherwise invisible universe, from exploding stars to dark nebulae.
The electromagnetic spectrum consists of radio waves (used in commercial television and radios, radar, microwaves ), infrared radiation, visible light, gamma rays, x-rays, and ultraviolet radiation rays.
All the wavelengths and frequencies of the electromagnetic spectrum are used in spectroscopy.
Thus the electromagnetic spectrum describes all the wavelengths of light.
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A chondroblast will produce the fibers and ground substance for
Answers
A chondroblast will produce the fibers and ground substance for cartilage
which biome would you find plants that are adapted to survive in hot dry climates
Answers
The desert biome is hot and dry, so it would be best for plants that can survive only in hot dry climates.
I hope this helps and have a nice day!
both parents are heterozygous for the Huntington's allele. what is the chance that their child will not have Huntington's disease
Answers
Answer:
25% or 1/4
Explanation:
The cross in this question involves a gene coding for the possession or not of Huntington's disease in humans. The dominant allele is denoted by (H) while the recessive allele is denoted by (h). The possession of the dominant allele by an individual means the possession of the Huntington's disease.
In a cross between two heterozygous parents i.e. combination of both dominant and recessive alleles (Hh). Four possible offsprings will be produced with genotypes HH, Hh, Hh and hh.
The genotypes HH, Hh and Hh will phenotypically possess the Huntington's disease while the hh genotype will not possess the Huntington's disease. Hence, the chance of having a child without the disease is 1/4 or 25%.
A neutron star collapses into a black hole because of the force of fusion or gravity
Answers
Fossil fuels are
A. a natural resource
B. renewable
C. made from minerals
D. burned in hydroelectric plants
Answers
Using technology, scientists are now able to use genetic information to classify new species. What is the likely impact of this advancement on the classification system?
The existing classification system may change to accommodate the new information.
The existing classification system will be replaced completely.
Organisms would be classified based only on their mode of nutrition.
Organisms would be classified based only on physical characteristics.
Answers
Should the system ever change.
Answer:
A
Explanation:
take in new information and let out old.
Which of the following describes a DNA mutation? A. The linking of free nucleotides into a long chain B. A change in the nucleotide sequence of a gene C. The packaging of DNA into a structure called a chromosome D. The substitution of uracil for thymine in RNA
Answers
Answer: The correct answer is -
B. A change in the nucleotide sequence of a gene.
Mutation can be described as permanent change in the genetic material of living organisms (that is DNA, deoxyribonucleic acid).
In other words, it depicts change in the sequence of nucleotide within gene (a segment of DNA that codes for particular protein).
It can be caused due to error in the replication process or by the exposure to some chemical, physical or biological agents (that are known as mutagens, such as UV radiation).
Mutation can result in altered protein, if change is within the coding region.
There are primarily three types of mutation, which are substitution, insertion, and deletion mutation.
Thus, option B) is the right answer.
Answer:
B. A change in the nucleotide sequence of a gene.
Explanation:
A DNA mutation refers to any alteration or change in the nucleotide sequence of a gene. This change can involve various types of modifications, such as substitutions, insertions, or deletions of nucleotides. Mutations can occur spontaneously or be induced by external factors like radiation or certain chemicals. These changes in the DNA sequence can impact the structure, function, or expression of the gene, potentially leading to phenotypic variations or genetic disorders.
What is the greatest cause of biodiversity loss today?
Answers
Answer: Habitat destruction is a major cause for biodiversity loss. Habitat loss is caused by deforestation, overpopulation, pollution and global warming. Species which are physically large and those living in forests or oceans are more affected by habitat reduction.
Explanation:
The diverse life forms living mutually in a region is called biodiversity. It comprises flora, fauna, microbes, fungi and many others.
The major cause for biodiversity loss today is Habitat destruction.
Due to the large cutting down of trees, overgrazing of fields, contamination and global warming the natural environment of flora and fauna are disturbed.Due to human interventions many animals have lost their territories and are on edge of extinction.Humans have cleared large forest regions to set up industries and construction units causing deforestation.Over exploitation of sources has led to the deficiency of reservoirs like petrol and diesel.Therefore, habitat invasion is one of the greatest cause for biodiversity loss.
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Automobiles cause air pollution when they burn gasoline. Laws have been passed to make automobile manufacturers limit the amount of pollution released from automobiles. Which act or organization was MOST LIKELY responsible for these laws?
Answers
Ben visited an ecology museum. He was stunned to see a wide variety of plants and organisms that he would’ve otherwise overlooked. As Ben works on his class assignment, he needs to classify organisms as autotrophs and heterotrophs.
Answers
Fill in the blanks.
Ben visited an ecology museum. He was stunned to see a wide variety of plants and organisms that he would’ve otherwise overlooked. As Ben works on his class assignment, he needs to classify organisms as autotrophs and heterotrophs.
Ben should classify --------- as an autotroph. He should classify --------- as
a heterotroph.
Blank 1:
a- an adult dog
b- a ladybug
c- a mango tree
d- a toddler
blank2:
a- algae
b- a jasmine plant
c- a mushroom
d- a potato
ANSWER
1. Ben should classify A MANGO TREE as an autotrophs.
Autotrophs are plants, which have the ability to produce their own food by making use of the combination of energy from the sun, carbon dioxide and water. The process, which these plants use to manufacture their food is termed photosynthesis. Autotrophs are the primary food producers in all ecosystems, they produce the foods, which other animals feed on.
2. Ben should classify A MUSHROOM as a heterotrophs.
Heterotrophs are living organisms, which do not have the ability to manufacture their own food, therefore they depend on foods that are produce by the autotrophs and they also feed on other animals. Mushrooms can not produce their own food, therefore they feed on food manufactured by autotrophs.
The other person's answer is much more complex, but I'll just give you one anyway.
Blank 1 - Mango tree
Blank 2 - A mushroom
:D
WILL MARK BRAINLYST
Two squirrel populations are prevented from mating with each other because they live on opposite sides of the Colorado River. After thousands of years of evolution, the two populations have become two separate and distinct species. They can no longer mate and produce fertile young with the other squirrel population. This process is an example of
A, speciation
B, resistance
C,fossil record
D, asexual reproduction
Answers
Mendel suggested that each trait is the result of the interaction of two factors for that trait.
Which term names these factors?
A.
genes
B.
alleles
C.
traits
D.
gametes
Answers
Alleles is the term which terms the factor mentioned by the Mendel.
B. alleles
Explanation:
Alleles allude to various types of similar qualities. Greg-or Mendel known as the Father of Genetics played out a trial with various attributes of pea plant which actuates seed shape and shading, pod shape and shading, blossom shading, stem size and area of the bloom in the stem. He crossed qualities liable for the effort of these attributes.
He made a cross among, tall and diminutive person pea plants. The allele for the tall plant is "TT" while the allele for the diminutive person plant is "tt".When they are crossed the posterity will be Tt which expresses that all are tall. From this Mendel recommended that every character is the consequence of the collaboration of two alleles for that quality that is "TT" and "tt" are the alleles liable for the effort of an attribute called tallness.
B ia your answer hope this helpe
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Which term represents the time in between cell divisions?
A. Cytokinesis
B. Interphase
C. Metaphase
D. Mitosis
Answers
Answer: B
Explanation:
The term representing the time in between cell divisions is known as Interphase, during which the cell grows, duplicates its DNA, and prepares for division. Correct option is option B.
The term that represents the time in between cell divisions is known as Interphase. This is a phase of the cell cycle, during which the cell grows, duplicates its DNA, and prepares for division. It is the longest phase of the cell cycle.
The options you've listed are all stages or processes related to the cell cycle. For instance, Cytokinesis is the process where the cytoplasm of a single eukaryotic cell divides to form two daughter cells. On the other hand, Metaphase and Mitosis are phases of cell division. However, they represent the division phase itself, not the time between divisions. The correct answer is Interphase.
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what structures work in antagonistic pairs to move bones?
Answers
Answer is Muscles.
Muscles work on contraction. Muscles can only pull and cannot push. This means that a muscle can only move a bone in one direction and there is no way to move the bone back again. This problem is solved by having muscles in pairs, called antagonistic muscles. The antagonistic muscles work in pairs. One muscle contracts while the other relaxes.
For example, the lower arm is moved upwards when the biceps muscle contracts and the triceps muscle is relaxed. To lower the forearm again, the triceps contracts and the biceps relaxes.
What causes the seasons? Please use two complete sentences
Answers
Answer: The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-cicular path around the sun).
Explanation:
What conclusion does the fossil record support?
A. Species have changed over time.
B. Traits acquired during a lifetime are passed to offspring.
C. Earth's organisms have not changed over time.
D. All of Earth's organisms were formed at the same time.