The correct answer is B. pollution.
Answer:
A dichotomous key is an important scientific tool, used to identify different organisms, based the organism’s observable traits. Dichotomous keys consist of a series of statements with two choices in each step that will lead users to the correct identification.
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Your welcome! :)
Answer:
i think b and c. but not sure what the third is? only 70% sure.
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there u go lol I guessed and got it right