LOCAL ENVIRONMENT ISSUE:
People dump a lot of trash in the sea, and the sea creatures living there goes through a lot of trouble to live with all the muck getting in them. Of course, don't write it like that in your assignment - you'll get told off for the straight forwardness.
Answer:
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The answer is B because the humoral immune response is mediated by antibody
It forms the outer layer of a cell. It gives an animal cell its shape. It is selectively permeable.
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