The boundary between the crust and the mantle is the
inner core
athenosphere
outer core
moho

it would be c. xylem.

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.