Structures called placentas, which nourish developing embryos, evolved in _______.
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Q80: Which of the following is the most
Q81: _ are bilaterally symmetrical animals that possess
Q82: The early fishes that evolved jaws are
Q83: During the Devonian, the partly terrestrial _
Q84: The muscular pharynx of an acorn worm
Q87: The evolution of primitive _ in the
Q87: The evolutionary lineage leading to birds is
Q88: The lineages leading to modern reptiles began
Q89: The _ include tarsiers, New World monkeys,
Q93: The cartilaginous fishes control their movement with
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