7. In the biosphere, a. both trees and animals emit oxygen
b. trees emit oxygen and animals consume oxygen
c. animals emit oxygen and trees consume oxygen

B

Explanation:

Trees release oxygen which is a product of photosynthesis which animals use for cellular respiration

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

b is dominant over the allele for the white fur.