How canna person donate blood and never run out of it? a)blood componentes are continuously pumped by the heart. b)blood componentes are continuously circulated through the blood vessels. c)blood componentes are continuously produced in the bone marrow. d) blood componentes are continuously digested by enzymes.

The ocean layer of a rapid temperature change with deph is known as the

What role do traits play in affecting an organisms ability to reproduce? finches

Ascientist wants to determine the effect of a new type of gasoline. he fillsone car with normal gasoline and another identical car with the new gasoline. which is the control group? a. the new type of gasolineb. the car with the normal gasolinec. the car with the new gasolinethe amount of gasoline usedd. the amount of gasoline used