The early divisions of the zygote are called cleavage. True or False?
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Q61: In blastulas, if cells from an area
Q62: At 10 weeks, the blastula becomes an
Q63: The extraembryonic membrane that sends blood vessels
Q64: In a morula, the cells are still
Q65: Yolk sacs are found only in animals
Q67: Homeobox genes determine the overall shape of
Q68: Maternal blood and fetal blood are mixed
Q69: The nervous system develops from the endoderm.
Q70: All amphibians, reptiles, and mammals pass through
Q71: In species with direct development, fewer offspring
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