Q1:  What types of evidence suggest that choanoflagellates and sponges are related?  

Q2: Why is the presence of highly specialized cells evidence for common ancestry?

Q3: In terms of cell types and functions, how do a hydra and a sponge differ from one another?

Q4: What kind of evidence, in modern organisms, might lead you to conclude that the last common ancestor of plants and animals had flagella?

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