Choose all the answers that apply. The heart ___.
pumps blood to the body
has four chambers
is part of the cardiovascular system
is made of skeletal muscle
works with the respiratory system

pumps blood to the body

has four chambers

is part of the cardiovascular system

Explanation:

First dude don't know his science

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

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.