A. Size, because it would determine if the molecule can fit though the pores.
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1) A small group of birds arrives from South America.
2) Geographic isolation
3) Changes in gene pool
4) Behaviors from interbreeding
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False. It's not always reliable. For example, in lab mice, saccharin has caused tumors. But for humans to get cancer from saccharin, we would have to take in astronomical levels of saccharin, which we, as humans, don't do.
Answer:
D. organ systems
Explanation:
Organs and tissues that perform the same function are called organ systems