Answer:
Cell membrane
Explanation:
The cell membrane is a flexible and permeable skin surrounding a cell.
Answer:
Increasing substrate concentration
Explanation:
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The correct answer is D. The theory of natural selection provided a better explanation of the processes that were being observed by the scientists.They observed that the related species birds found on one island were slightly different from that of the other, and certain portions earth, have the species, which were not found anywhere else.
Answer:
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