I believe it is the crust
Answer: Migration, because species move to other places for food or a better or more suitable habitat and sometimes their is other species there.
The answer is C your welcome (:
Answer: it is also known as blue- green algae .
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Explanation: These microbes conduct photosynthesis : using sunshine , water and carbon dioxide to produce carbohydrates and , yes , oxygen ...... ''what it looks like is that oxygen was first produced somewhere around 2.7 billion to 2.8 billion years ago . </h3>
