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Scientists believe that early plants released oxygen in a process called photosynthesis. where did the carbon dioxide needed for photosynthesis come from in the early atmosphere?
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Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm
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Fill in the blank with the correct sphere label. a: ⇒ geosphere b: ⇒ biosphere c: ⇒ hydrosphere
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Agroup of organisms that changes over time is said to
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Scientists believe that early plants released oxygen in a process called photosynthesis. where did t...
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