The palaeozoic started in a period in which invertebrates started proliferating rapidly and in large amounts, which was considered a historical event and the end of that gigantic era.
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Sister chromatids separate during anaphase

B.) speeds up chemical reactions
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Answer:Organisms rely on each other to sustain the ecological environment, something that humans have been lacking in. So, in general, organisms are interdependent because they have no choice. There are more particular instances (mutualism, symbiosis, etc.) where the connection is more local and direct.
Explanation:
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The correct answer would be a hospital