Examlex
Proof that Earth revolves around the Sun is obtained by the use of ______________ and the ______________.
Sperm
Male reproductive cells or gametes involved in sexual reproduction, carrying genetic information to the ova.
Egg
An organic vessel in which an embryo first begins to develop, commonly consumed as food by humans.
Germinal Stage
The earliest phase of prenatal development, encompassing the first two weeks after conception, during which the fertilized egg divides and implants in the uterine wall.
Embryonic Stage
A phase of prenatal development that occurs from the second to the eighth week after fertilization, during which major body structures and organs begin to form.
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