The stage in mammalian development when the embryo exists as a hollow,fluid-filled ball is referred to as the ________.
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Q37: In mammals,the trophoblast layer in a blastocyst
Q38: Examine this close-up of the placenta (on
Q39: During the rapid cell division that occurs
Q40: The quality of human eggs declines as
Q41: The ovaries produce _ gametes than the
Q43: Human chorionic gonadotropic produced by the trophoblast
Q44: Oogenesis produces one egg from a germ
Q45: In humans,development from zygote to completion is
Q46: An aquatic animal that relies on currents
Q47: During fetal development humans develop a small
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