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Answer:

Across
2Spontaneous _____
3organisms whose cells contain a nucleus and other membrane-bound organelles.
5A shared character is one that two lineages have in _____.
6 any organism that lacks a distinct nucleus and other _____
Down
1a class of similar things, especially a group of animals or plants that includes several closely related species.
4the process whereby distantly related organisms independently _____ similar traits to adapt to similar necessities
 
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