Hey there,
Answer:
Hope you are asking for this - <span>Endosymbiosis.
Hope this helps :D
<em>~Top♥</em>
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Answer:
A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. Keys consist of a series of choices that lead the user to the correct name of a given item. "Dichotomous" means "divided into two parts".
Explanation:
You have to do the cross-back before making any conclusions.
