Answer:
Animals need resources to survive.
Explanation:
With a lack of enough resources for various animals, it generates competition for resources and eventually animals will start to starve and die off.
The correct answer is: desertification.
Desertification is a process in which a land which was not a desert before, becomes one. This process can include drying out- through for example loss of water source, such as river diversion- and the loss of vegetation.
I believe it is <u>instinct </u>that is the behavior of the caterpillar building a cocoon.
When you insert a nucleotide into a DNA sequence, this is a frame shift mutation. All of the letters after the insterted nucleotide will be shifted one place, changing the whole protien which was coded for. Whatever protien was coded for by that DNA sequence is now changed, resulting in a phenotypic change.