The kidneys help maintain the homeostasis of the body by a. Absorbing excess calcium from blood and bone marrow
b. Adjusting the levels of oxygen and carbon dioxide in tissues
Excreting ammonia from the body to decrease acid levels
d. Maintaining a narrow temperature range for body systems

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

explanation:

okay now i don't know this but for the pints nothing else to say bye