To help your immune system prepare for diseases
You are likely to see a connotation used in both advertisement and also some university lectures. If only one answer is permitted, B is the best answer.
Well a theory is when a person comes up with something that they believe is to be true, and they work on projects and other things to show their thinking. theories won't always bee correct which helps us humans grow and come up with new ones
D. Most of the energy that drives metabolism is supplied by ATP
In adults, stem cells remain undifferentiated until they are needed to repair or replace other cells. Stem cells can produce cells that are identical to themselves.
