The primitive groove of bird and mammalian embryos is analogous to the _______ of amphibians and sea urchins.
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Q81: The rod that forms from the chordomesoderm
Q82: Of the three germ layers that develop
Q83: In mammals, the sac that secretes fluid
Q84: One of the earliest stages of organogenesis
Q85: During the second trimester of pregnancy in
Q87: A cell is said to be _
Q88: In chicks, the first extraembryonic membrane to
Q89: Gas exchange and waste removal for a
Q90: The rupturing of two extraembryonic membranes and
Q91: The process in development by which germ
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