A. external
These types of signals are observed when there is a cut on the body. The epidermal cells lose contact with one another and divide faster until they are in contact once again. After they come into contact, division slows down again.
Answer:
to break down food into smaller , usable form
Explanation:
the stomach breaks down food into smaller, usable forms
Answer:
increases levels of greenhouse gases
Explanation:
Answer:
The meaningful differences between organisms in a population are genetic. Variations in the genome of members of a population arise through mutation. Occasionally, a mutation occurs in an individual that is beneficial, that helps that organism be better able to survive and repoduce in its current environment.
Mitosis, since it involves the process of splitting into two daughter cells.
