All vertebrate embryos resemble each other during the early stages of development. For example, fish, turtles, chickens, mice, and humans develop tails and gill slits during early stages of development. This suggests that _________.

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    ancestral vertebrates possessed genes that directed the development of tails and gill slits, and all of their descendants still retain those genes
    genes that modify the developmental pathways in vertebrates arose later in evolution
    early embryonic development is conservative
    all of the above

asked May 30, 2013 in Biology by anonymous
    

1 Answer

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all of the above
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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