Answer:
<em><u>mutualism</u></em>
As Mackenzie told us, the mutualism between strawberry poison dart frogs and bromeliads is “evidence of the complexity that exists in the biological world and the interconnectedness of species.”
Explanation:
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I'm pretty sure that was <span>Oswald Avery.</span>
The answer is B, because layers mix better at the poles.
