The answer is D its tightly packed cells allow for proctection against harmful substances.
Scientists are helping to improve understanding of how rocks in Earth's hot, deep interior enable the motions of tectonic plates, which regulate the water cycle that is critical for a habitable planet.
the answer would be d. a start base triplet
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Because sexual reproduction is faster than asexual reproduction. The water flea would have to inseminate itself somehow with asexual, but sexual reproduction is faster in terms of the male can inseminate many female fleas at once.