Elevated blood cell count can be a result of:
a. bacterial infection
b. viral infection
c. parasitic infection
d. immune hypersensitivity/ allergic reactions
e. all of the choices are correct.

Gabriel is at a stage where his body is changing physically; he is growing facial hair and building muscle. he is also just starting to make sperm. what is most likely gabriel’s age? 5 12 17 21

An easy way to calculate the amount of energy available at each level is to what?

In what for do plants utilize nitrogen? why do they need nitrogen?