The tick uses the dog for two reasons. 1.It uses the dog as a source of food. 2.It also uses a dog for means of transportation from one place too another. And so the dog gains nothing
Answer:
A. increase its number of cells
Explanation:
The cell cycle allows multicellular organisms to grow and divide and single-celled organisms to reproduce.
The primary difficulty is the fact that we do not know all of the organisms that currently exist in the world along with those that existed in the past.
Valves, they are like flaps of muscle that keeps the blood in its place util its ready to be pumped along.
