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Why do simple animals, such as flatworms and sea stars, survive without special circulatory systems but more complex organisms, like reptiles and humans, cannot?
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During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic
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Soil is made of air water organic material minerals weathered rock
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Explain the reason for having an equator and a prime meridian. how do these two lines us to navigate our world? describe your opinion in at least two to three sentences.
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Why do simple animals, such as flatworms and sea stars, survive without special circulatory systems...
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