Which is not a function of the kidneys?
a. they regulate osmolarity of the body fluids.
b. they fight osteoporosis by synthesizing vitamin d.
c. they control blood pressure.
d. they release waste into the bloodstream.

D. They release waste into the bloodstream.

Explanation:

Kidneys are the primary organs of the excretory system. Their primary function is to remove the metabolic waste from the blood and release it out of the body in the form of urine. The nitrogenous waste, drugs, uric acid, and other metabolic waste products are removed from blood in kidneys.  

Hence, kidneys do not release the waste into the bloodstream, rather release them out of the body and filter the blood.  

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.

a = executive branch; b = judicial branch