Which of the following features are true of all three types of worms (flatworms, roundworms, and annelids)?

Select all that apply.

closed circulatory system
true coelom
bilateral symmetry
cephalization
three tissue layers

Which of the following may one conclude from a map that shows the average ph value of rainfall in the u.s.? acid rain is a more serious problem on the east coast. acid rain falls equivalently across the continental u.s. there are more factories on the west coast. the midwest has fewer forests than the rest of the u.s.