1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
natulia [17]
3 years ago
15

Describe the four reasons evolution occurs

Biology
1 answer:
Liula [17]3 years ago
4 0

Answer:

Organisms produce more offspring than actually survive.

Organisms can die from many causes: disease, starvation, and being eaten, among other things. The environment can't support every organism that is born. Many die before they are able to reproduce. One hundred (100) beetles can produce 6.1 x 1028(61 with 27 zeros after it) offspring in only 82 weeks (less than two years). Each beetle weighs 10 mg, and if they all survive, their total weight after 82 weeks would be 6.1 x 1021 (61 with 20 zeros after it) metric tons, equal to the weight of the entire earth. Obviously, their environment can't support all of these beetles, and many of them die.

The fish eggs at left are only a small fraction of those laid by a single fish. If all of the fish hatched and each of them laid as many eggs, which all hatched as well, there would be too many fish for the fishes' environment to support. [2]

2. Every organism must struggle to survive.

One reason that not all organisms survive is that there are not enough resources, things that they need, to go around. Organisms must struggle to get what they need to survive, competing against other organisms that want the same things they do. They also have to struggle to get away from predators and to overcome disease. For example, a fox struggling to catch a rabbit, which struggles to escape. As explained in part one, not all of them make it.

3. There is variation within a species.

Not all of the individuals in a species are exactly the same. There are variations, differences, among members of a species. If you look at the spots on several different ladybugs, or the stripes on zebras, you will notice that they don't all have the same number or arrangement of spots or of stripes. In addition to these easily visible variations, there are differences in skill and behavior, such as differences in how fast the zebras can run. If organisms were all the same, none would be better suited than any other, and selection could not occur.

4. Some variations allow members of a species to survive and reproduce better than others.

If an organism has a trait that helps it survive or reproduce, it is more likely to survive and be able to reproduce. A faster cheetah is more likely to catch a gazelle and survive, and a faster gazelle is more likely to escape the cheetah and survive. A showier flower is more likely to be noticed by a bee, which enables it to reproduce. A thornier cactus is more likely than other cactuses to be left alone by animals, rather than be eaten and die.  

5. Organisms that survive and reproduce pass their traits to their offspring, and the helpful traits gradually appear in more and more of the population.

Most of an organism's traits are passed on to its offspring. If more of the organisms with the helpful trait survive, then in the following generations, more and more of the population have that trait. If there are some faster cheetahs and some slower cheetahs, the faster cheetahs will be better able to catch food and survive. With more of the slower ones dying before they can reproduce, and more of the faster ones surviving and reproducing, over generations the population on the whole will gradually become made up of faster cheetahs.

Explana

You might be interested in
True or false<br>processing maintains quality control .​
Colt1911 [192]

Answer:

True

(I am not 100% sure because the question is very short with no context, but I believe it to be true)

8 0
3 years ago
Which of the following outcome would be most likely if the proteins emmbedded in a cell membrane became unable to function prope
Andreas93 [3]
C) The Cell Would Be Forced To Divide as substances continued to build up inside the cell
8 0
3 years ago
Read 2 more answers
Sand that extends from a coast into open water is called a barrier spit. <br> a. True <br> b. False
AysviL [449]
<span>It is True - Sand that extends from a coast into open water is called a barrier spit.

Barrier spits are formed when there is a deposit on the shoreline due to the lateral movement of water.

The waves are known to hit the shoreline at a particular angle which cause the lateral movement of water accompanied with the sedimentation along the coastline in the direction of the wave motion.</span>
6 0
3 years ago
what is the role of phloem in a vascular plant? a) transport carbohydrates from chloroplasts b) transport water the roots c) tra
Oksanka [162]

The correct answer is option A

Phloem is a vascular tissue which helps in the transportation of sugars from the source tissue( where it is formed).  The carbohydrates or sugars are transported from the chloroplast of the plant to the other parts of the plant. Other molecules along with carbohydrates are also transported with the help of phloem.




4 0
3 years ago
Read 2 more answers
A germ cell of an organism has 60 chromosomes in it. It undergoes meiosis, and at the end it produces four daughter cells. What
const2013 [10]
30. Assuming that meiosis was undergone without error, the daughter cells formed are haploid.
7 0
3 years ago
Read 2 more answers
Other questions:
  • What is the biggest alligator ever found?
    13·1 answer
  • The process by which a final product acts as an inhibitor to the enzyme that catalyzes the commitment step in a metabolic pathwa
    12·1 answer
  • How is the scientific law different from scientific theory ​
    9·1 answer
  • Unlike rocks, all minerals ________ and ________.
    6·1 answer
  • Pressure is_____if you heat something, because the_____in temperature causes the molecules to move_____and_____more.
    12·1 answer
  • Which of the following is not one of the three types of rock?
    13·2 answers
  • TRUE/FLASE the function of DNA is to store genetic material ( please help its due right now )
    13·1 answer
  • Question 8 of 10<br> Which question can be answered using the scientific process?
    11·2 answers
  • I need to know this I will MARK BRAINLIEST WHO EVER ASWERS FIRST
    8·2 answers
  • Transport of food in higher plants takes place through?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!