C. Cnidarians and echinoderms is the answer.
There are 3 phyla that sorts worms platyhelminthes (flatworms), nematodes (round worms) and annelids (segmented worms). The closest one is C.
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Answer:
Gradually cool a gas and record its change in state.
Explanation:
The experiment is directed towards the removal of thermal energy from a system, so "gradually cool a gas and record its change in state" is the best experiment to use.
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Gregor Mendel' research formed the basis of the field of genetics.