Question

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Answer 1

If all these different species share one characteristic, there’s a good chance they had a common ancestor with that characteristic, right?

Answer 2

So with that in mind which answer choice do you think is true?

Answer 3

c?

Answer 4

Note that these embryos belong to very different species. When they’re adults they look different.

A is the only one that makes sense. Because they all have gills as embryos, it’s likely they evolved from some ancestor that also had gills.