The instrument of choice would be the the clam shell sampler, which is also know as a grab sampler. Another instrument they use is the piston corer which is an open tube on a cable that gets dropped from a ship.
Answer:
HMMM DID ANYONE JOIN ON URS?
Explanation:
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Disease and salinity is the answer you are looking for
The rhythmic contractions of the stomach and food along the alimentary canal is called peristalsis