Which best describes a role of animals in the water cycle?

a. they water vapor condense when they produce waste.

b. they water vapor condense when they inhale.

c. they release water vapor through transpiration.

d. they release water vapor when they exhale.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.