Examlex
Peter the Great financed his reforms by imposing a large number of new taxes, the burden of which fell mainly on the:
Blastopore
The opening of the central cavity of an embryo in the early stage of development, which can develop into the mouth or anus in different animals.
Blastocoel
The fluid-filled cavity that forms inside the blastula, an early stage in the embryonic development of animals.
Capacitation
A physiological change that sperm undergo to gain the ability to penetrate and fertilize an egg.
Allantois
An extra-embryonic membrane in birds, reptiles, and mammals that is involved in gas exchange and waste removal.
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