Answer: B
Explanation:
Chemical reaction represents the chemical changes in a reactant that results in a product. As the reaction proceeds, the electron rearranges themselves to form or break bonds. Thus, option a is correct.
What is a chemical reaction?A chemical reaction is a conversion process where the reactant undergoes chemical changes to get converted into one or more products that are different and new.
The product or the new substance is formed as a result of the electron rearrangement that leads to the splitting or formation of the bonds among the reactants.
Some chemical reactions absorb heat from surroundings, while some releases heat into the environment. But in a reaction, the mass remains conserved.
Therefore, option a. the electron rearranges to split and create new bonds is correct for a chemical reaction.
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How could the situation in Haiti be improved?
Answer:
Billions of dollars of foreign aid has poured into Haiti with little to show for it. This is largely because that money has come to do for Haitians what, with a little help in expertise, they could have done for themselves. This is the biggest difference between aid and development. As a result, 74% of Haitians are either unemployed or under-employed and 8.5 million live on less than $2.41 per day.
Aid is designed to help with immediate needs. As important as that is at times, aid is not the solution to Haiti’s long term challenges. The Haitian people are the solution to Haiti’s problems, particularly those who have the skills and character to build a stronger Haiti for all.
By helping men and women gain the skills to build, train, and lead, you have the power to unleash Haiti’s potential to create a stronger future. Through Extollo’s unique approach to development you will help build stronger careers, stronger families, stronger communities, and a stronger infrastructure for all Haitians.
Explanation:
Answer:
The situation in Haiti could be improved by screening UN workers for illness, increasing water sanitation, and providing adequate sewage treatment.
Explanation:
right on edge
Which mineral is used in making cans and is found mainly in Australia?
hematite
bauxite
tektite
magnetite
Answer:
bauxite
Explanation:
I just took the test!
Which term does NOT belong with the others?
photosynthesis
autotroph
algae
mushroom
Answer:
mushroom
Explanation:
Cause they cant do photosinthesis and they are not autotrophs.
(please Brainlies)
Choose two ways that carbon (usually in the form of CO2) enters the atmosphere. *
1 point
Captionless Image
Feeding
Respiration
Decay
Fossil Fuel Formation
Auto and factory emmisions
Photosynthesis
Answer:
respiration
fossil fuel formation
Explanation:
remains of plants and animals results to fossil fuel formation when these fuel burnt they release CO2 in the atmosphere
respiration of living things release CO2 in the atmosphere
The human population is closest to ______. *
1.) 8 million
2.) 7 billion
3.) 7 million
4.) 8 billion
Answer:
4) 8 billion
Explanation:
Answer:
I sent 8 million
Explanation:
see attachmentss!!!!!!!!!!!!!!!!!!!!1111
Select all of the statements that are examples of technology in science.
chemists using a computer program to analyze data from their experiments
physicists using a water tank to observe the way waves interact with a model vehicle
biologists writing down observations of animal behavior
physicists discussing the results of an experiment
geologists using a seismograph to record vibrations moving through the Earth
Answer:
A, B, E
Explanation:
Answer:
First, second, and the last one
Explanation:
I took the teat and got it right :)
Which statement best describes the relationship between changes in air pressure and wind speeds?
When a high- and a low-pressure air mass are far apart, air moves quickly from low to high pressure.
When a high- and a low-pressure air mass are far apart, air moves quickly from high to low pressure.
When a high- and a low-pressure air mass are far apart, air moves slowly from high to low pressure.
When a high- and a low-pressure air mass are close together, air moves slowly from high to low pressure.
The statement that best describes the changes in air pressure and wind speed is related to the high pressure and low pressure that is different in the winds.
The region with low pressure will always get winds from the high pressure. This means that the region of low will attract winds from the high pressure and vice versa.This is due to the temperature and pressure difference.
Thus the option C is correct.
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Answer: C
Explanation: Took the tes
Which of the following organisms undergo both photosynthesis and cellular respiration? Select all that apply. * 1 point Dogs trees grass flowers humans
Final answer:
Plants, grasses, and flowers undergo both photosynthesis and cellular respiration, while dogs and humans rely on consuming organisms that have undergone photosynthesis for their energy needs.
Explanation:
Plants, grasses and flowers undergo both photosynthesis and cellular respiration. Animals like dogs and humans do not perform photosynthesis but rely on consuming plants or other organisms that have undergone photosynthesis for their energy needs.
what is the function of Mitochondrion?
Answer:
The main function of mitochondria is to perform cellular respiration. This means it takes in nutrients from the cell, breaks it down, and turns it into energy.
5. Describe: How did Earth's oceans form?
The earth began as a cloud of dust and hot, shining gas. When our planet began to cool, its surface solidified, surrounded by clouds of water vapour. When this vapour condensed (changed into liquid) and began to fall like rain, seas, and oceans formed in the hollows of the Earth’s surface. Oceans are huge expanses of water which separate the Earth’s continents. The largest ocean is the Pacific Ocean, second, the Atlantic and third largest, the Indian Ocean. Seas are smaller expanses of water, almost always flowing either into oceans or other sea. The waters of the seas and the oceans are always salty, because they are rich in mineral salts and especially sodium chloride, which is the salt used in cooking.
Answer:
the ocean formed from the escape of water vapor and other gases from the molten rocks.
Explanation:
After the earth's surface had cooled to a temperature below the boiling point of water , rain began to fall - and continued to fall for centuries . Hope this helped .
Describe the difference between a gene mutation and a chromosomal mutation.
Answer:
Gene mutation is a change in the nucleotide sequence, in a particular gene, whereas chromosomal mutation is a change in several genes, in the chromosome. Gene mutation is only a slight structural alteration, whereas chromosomal mutations are either numerical or structural changes in the entire DNA strand.
Explanation:
A gene mutation is a change in the smallest unit of a gene, affecting a single nucleotide or a few of them, while a chromosomal mutation is a change that affects an entire chromosome or large parts of it, causing large-scale genetic changes.
Explanation:A gene mutation refers to a change in the smallest unit of a gene, specifically at the nucleotide level. For example, one nucleotide may be replaced by another, or perhaps extra nucleotides may be inserted or deleted altogether. This, in turn, may affect the translation and the subsequent products created by that gene.
On the other hand, a chromosomal mutation is a change that affects the entire chromosome or large parts of it. It can involve deletions, duplications, or rearrangements of large segments of the DNA within the chromosome. An example could be Down's syndrome, which is a result of an extra copy of the 21st chromosome.
As you can see, the main difference between a gene mutation and a chromosomal mutation lies in the scale of the change, with gene mutations being smaller, more localized changes, and chromosomal mutations being changes on a larger scale.
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Some steps in cell division are shown below:
1. Chromosomes condense and pair up
2. Segments of DNA of sister chromatids twist and cross
3. Exchange of DNA occurs between chromosomes
4. Four daughter cells are created that are haploid
Which of the following steps is least likely to occur during meiosis 1?
A) Step 1
B) Step 2
C) Step 3
D) Step 4
Answer:
D. step 4
Explanation:
the cell divides into two daughter cells during meiosis 1
Answer:step 4
Explanation:
In meiosis, the breaking up of chromosomes occur to form new daughter cells. The chromosomes break into haploid parts and then the two daughter cells formed then twist and exchange their genetic information. Division into four daughter cells is less likely to occur during meiosis 1.
Fossil fuel dependence is associated with _______.
Answer:
release of enormous amounts of greenhouse gases
Explanation:
Answer:
Environmental consequences, economic consequences, and development hindrances
Explanation:
Hope this helps!!!
If a human has an extra copy of one pair of homologous
chromosomes, how many chromosomes will she have in total?
Answer:
48 chromosomes
Explanation:
The genetic condition described in the question is referred to as ANEUPLOIDY, which is a chromosomal disorder. ANEUPLOIDY occurs when there is an extra or missing copy of a chromosome in the normal set of chromosomes. It occurs mainly due to the fusion of an abnormal gamete.
A karyotype shows that human cell consists of 46 chromosomes in total I.e. 22 pairs of body and 1 pair of sex chromosomes. A human is a diploid organism I.e. contains two set of chromosomes. This means that one set of chromosomes (haploid, 23 chromosomes) is contributed by one parent.
Therefore, in a case whereby, an extra copy of a pair of homologous chromosomes is contained in the genome of a human. Hence, this will be 2n + 2 which means 46 chromosomes plus two extra chromosomes = 48 chromosomes. This ANEUPLOIDY likely resulted from the fusion of two abnormal gametes that are n+1 each.
Which of these qualities is an advantage of LED lightbulbs?
O
O
A. They are harder to dispose of than traditional lightbulbs.
B. They last much longer than traditional lightbulbs
C.
They are more expensive to buy than traditional lightbulbs.
O
D. They use more energy than traditional lightbulbs.
Answer:
B. They last much longer than traditional lightbulbs
The important quality which is an advantage of LED lightbulbs over normal lightbulbs is they last much longer than traditional lightbulbs. Thus, the correct option is B.
What are LED Lightbulbs?
An LED lamp or the LED light bulb is an electric light which produces light using the light-emitting diodes. LED stands for Light Emitting Diode. LED lamps are significantly much more energy-efficient than the equivalent incandescent traditional lamps and these can be significantly more efficient than that of most of the fluorescent lamps.
LED lightbulb products produce light up to 90% more efficiently than the incandescent light bulbs. An electrical current passes through a microchip which is responsible for the illumination of the tiny light sources which we call LEDs and the result is the visible light.
LED lightbulbs have longer life as compared to the incandescent lamps. LED lightbulbs require low operational voltage and also less power as compared to that of incandescent lamps. LEDs also have a fast on-off switching capability.
Therefore, the correct option is B.
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3. Is it possible for a mom who can see color and is a heterozygous carrier for
colorblindness (XRXr) and a normal-vision dad (XRY) to have a colorblind
daughter? Explain and show your understanding. Colorblindness is an
X-linked recessive trait.
1. If Mike drove for nine hours at a speed of 105km/h, how far did he drive in meters (m)?
2. Ann jogged 5.5 miles south to her house in 0.9 hours. What is Ann's speed? What is Ann's velocity?
3. How long will it take a car to accelerate from 18.9 m/s to33.7 m/s if the car has an acceleration of 4.2m/s2?
Answer:
1) 945000 m
2) 6.11 miles/hour
3) 3.52 seconds
Explanation:
1. Speed is the time rate of change of distance, it is the ratio of distance to time. Speed is given by the equation:
[tex]speed(S)=\frac{distance(d)}{time(t)}[/tex]
Given that:
Time (t) = 9 hours and Speed (S) = 105 km/h
[tex]S=\frac{d}{t}\\ d=S*t=105*9=945km=945000m[/tex]
2) Time (t) = 0.9 hours and distance (d) = 5.5 miles
[tex]S=\frac{d}{t}\\ S=\frac{5.5}{0.9} =6.11miles/hour[/tex]
3) Acceleration it is the ratio of velocity to time. Acceleration is given by the equation:
[tex]Accceleration(a)=\frac{Final,velocity(u)-initial, velocity(v)}{time(t)}[/tex]
Given that :
a = 4.2 m/s² , u = 18.9 m/s and v = 33.7 m/s
[tex]a=\frac{v-u}{t}\\ t=\frac{v-u}{a}\\ t=\frac{33.7-18.9}{4.2}=3.52s[/tex]
Answer:
1) 945.000 meters
2) 9,84 kilometers/hour
3) 3,52 seconds
Explanation:
1) 105 km/h x 9 h = 945km
1km = 1000 meters 945 km = 945.000 meters
2) 1 mile = 1.61 km
5.5 miles x 1.61 km / 1 mile = 8,855 km
You have to do a single third rule to clear the x which is the Ann's velocity in 1 hour.
8,855km in 0.9 hs
x (velocity in 1 hour) = 9,84 km = 1 hs
1 hs x 8,855km / 0,9hs = 9,84km/h
v= 9,84km/h
3) you have to use this formula and clear T (time)
vf = v0 + a.t
vf-v0 = a.t
(vf - v0)/a = t
(33.7 m/s - 18.9 m/s) / 4.2 m/s2 = 3,52 seconds
Why do geologists need a geologic time scale? Give 2 reasons.
Answer:
Explanation: It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history. Like the periodic table, the Geologic time scale is one of those amazing human endeavors to turn a vast amount of evidence from astronomy, rocks, fossils, history and politics into a nifty little diagram which makes the whole thing appear nice, neat and resolved.
Answer:The main reason to use a geologic time scale is so that geology in a given place can be given a location in time.
Explanation:(here is the only one i could find)
A solar powered car converts _______________ energy into _________________ energy. A) light, chemical B) light, mechanical C) mechanical, light D) electrical, mechanica
Answer: B) Light to Mechanical Energy
Explanation:
Final answer:
A solar powered car converts light energy into mechanical energy by using photovoltaic cells to transform solar energy into electrical energy, which then powers an electric motor.
Explanation:
A solar powered car converts light energy into mechanical energy. In a photovoltaic cell, which is a component of solar panels, the energy transformation that takes place is that solar energy transforms into electrical energy. This electrical energy is then used to power an electric motor which provides the mechanical energy to drive the car. Thus, the correct answer to the student's question is B) light, mechanical.
Which of the following best describes a dichotomous key?
A. Uses a branching diagram called a cladogram to show relationships
B. Identifies plants by a series of choices between pairs of alternatives
C. is the systematic arrangement of plants into groups and subgroups based on common characteristics
D. Is a type of plant classification which uses a hierarchy system for classification
Answer:
i think it is c
Explanation:
It seems to be a logical answer.
The two most crucial aspects of a good key are that it presents two opposing options for each pair of clues, and that it gradually reduces the number of potential objects or organisms so that identification is achievable. Thus, option C is correct.
What are the best features of dichotomous key?Taxonomy is the systematic division of living things into groups based on what are thought to be their natural relationships.
The process of naming items or groups of things in accordance with their placements in a hierarchy is known as taxonomy.
An instrument that aids in identifying an unidentified organism is a dichotomous key. A dichotomous key is a set of statements with two possible answers that list traits of the unknown entity.
Therefore, dichotomous key is the systematic arrangement of plants into groups and subgroups based on common characteristics.
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I need help please and thank you
Answer:
Vacuoles
Explanation:
Vacuoles are the primary organelles for storing various substances in plant cells. These materials include water, ion, sugar, cellular compounds and more.
A large power plant burns coal to generate electricity for nearby homes and businesses. This contributes most directly to which short-term human-induced environmental change?
Answer:
global warming
Explanation:
Answer:
global warming
Explanation:
I think this is right. Hope this helps.
Antarctica can be classified as arid as well as polar. Explain.
Antarctica is both arid and polar because it receives very little precipitation, averaging less than 10 inches per year, which qualifies it as a desert despite being ice-covered. Dry conditions are caused by high-pressure polar highs and air circulation influenced by the Coriolis effect. The interior of the continent, as well as other polar regions, can be classified as high-latitude deserts due to extremely low temperatures and distance from moisture sources.
Antarctica can be classified as both arid and polar due to its climate conditions. While often being synonymous with ice and snow, Antarctica meets the criteria for a desert because it receives extremely low annual precipitation, averaging fewer than 10 inches a year. The majority of this precipitation falls as snow, with coastal regions receiving more snowfall, up to four feet annually, while in the interior near the South Pole, it may only be a few inches.
The reasons behind the aridity include the presence of two high-pressure systems, or polar highs, leading to very dry conditions. Cold sinking air is incapable of holding much moisture, which is exacerbated by the region's distance from moisture sources and the Coriolis effect that influences the polar easterlies' air circulation pattern. Furthermore, despite its ice cover, Antarctica is earth's driest continent because water present near the surface is frozen most of the year.
Understanding the classification of deserts and recognizing that not all deserts are hot and sandy, but in fact may be cold and icy, as in the high-latitude polar deserts, is key. The unique conditions in Antarctica, including its extensive ice shelves and occasional volcanic activity, combined with the political and environmental considerations, all contribute to the complex nature of this continent.
Inherited traits are traits that children get from their parents through
A.imitating their parents.
B.genes
C.Infections
D.sharing their parents' environment.
Correct answer is: B. Genes
Answer:
B: Genes
Explanation:
Parents give their traits by genes
Answer:
B. Genes
Explanation:
Genes are what provide inherited traits to offspring through a process called heredity.
SEEEE ATTACHHHHHMEEENNTTTTSS!!!!!
Explanation:
For question no 19
Force (F) = 20N
distance (d) = 5m
Work = F * d
= 20 * 5
= 100 J
Now
For question no 20
D. No matter how much force is applied the object must have motion for work to be done.
Answer:
The 19 is A and the 20 is D
Explanation:
Work done is N *m
So it gonna be 20N*5m
Giving 100J
The 20 work is only done when the object sets into motion
How does anaphase II differ from anaphase I?
Answer:
In anaphase II, the sister chromatids separate, and in anaphase I the homologous chromosomes separate.
Anaphase I and II, part of meiosis, differ based on what is being separated. Anaphase I separates homologous chromosomes while anaphase II separates sister chromatids.
Explanation:The major difference between anaphase I and anaphase II is the separation of different structures. In anaphase I of meiosis, homologous chromosomes are separated, while in anaphase II, the sister chromatids are separated. It means, that in anaphase I, the paired chromosomes (tetrads) move to opposite ends of the cell, whereas in anaphase II, the sister chromatids of each chromosome split apart and move to opposite ends of the cell.
This difference is because anaphase I occurs during the first meiotic division (meiosis I), where cells are reduced from diploid to haploid. Whereas, anaphase II happens in the second meiotic division (meiosis II), which does not reduce chromosome counts and is, therefore, more similar to mitosis.
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An energy pyramid shows the amount of
available at each feeding level in an ecosystem.
US
301
Answer:
Yes
Explanation:
An energy pyramid shows the amount of available at each feeding level in an ecosystem. This energy pyramid shows the amount of energy available at each tropic level showing the food energy progression. The pyramids contain energy starting with the producers (plants) at the bottom to primary consumers, tertiary consumers and so on up to the top of the food chain. The most common units are grams per square meter per year or calories per square meter per year.
How does natural selection work regarding individuals and populations regarding which will be most successful?
Answer:
Natural selection doesn't really choose what animal/species is going to survive it's all based on the environment they live in. While a blue bird does well in the jungle it may not do well in the desert. For individuals it's based on their genes and genetics. Some are more prone to have a trail that doesn't benefit them and in fact, harms them in their environment. For populations you will see lots of the same animals but with different traits so some may do better in the wild than others because of those traits. A population is more likely to be successful because you do better when working with others. So animals have a better chance to survive if there is more diversity.
The transition of light colored moths in an original population into dark colored moths after natural selection occurs is a classic example of
Directional selection.
Disruptive selection,
Normal selection.
Sexual selection.
Correct option is A. The shift from light to dark-colored moths due to environmental changes during the Industrial Revolution is an example of directional selection, as the darker moths had a higher survival rate.
The transition of light-colored moths to dark-colored moths in an original population after natural selection occurs is a classic example of directional selection. During the Industrial Revolution in nineteenth-century England, the environment changed due to the soot from factories darkening the trees. This led to light-colored peppered moths, which were originally well-camouflaged, becoming more visible to predators, while dark-colored moths became more camouflaged. As a result, the dark-colored moths had a higher survival rate, leading to an increase in their frequency over time, shifting the moth population from light to dark.