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Why are choanoflagellates considered to be the ancestor of animals?


Why are choanoflagellates considered to be the ancestor of animals? 

A. molecular data. 

B. similarities in tissue structure. 

C. similarities in Hox genes. 

D. similarities in embryonic development. 

E. None of the choices are correct.

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Answer #1

Answer:

E ) None of the choices are correct

The choanoflagellates are a group of free-living unicellular and colonial flagellate eukaryotes considered to be the closest living relatives of the animals. Choanoflagellates are collared flagellates having a funnel shaped collar of interconnected microvilli at the base of a flagellum. Choanoflagellates are capable of both asexual and sexual reproduction

There are striking physical resemblances between choanoflagellates and certain animal cells, specifically the feeding cells of sponges, called choanocytes. These similarities indicate that the unicellular ancestor of animals probably had a flagellum and a collar, and may have been much like a choanoflagellate

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