Reproduction is one of the fundamental characteristics of living organisms. The gonads (testes in men and ovaries in women) produce specialized sex cells, known as gametes. The basic function of sexual reproduction is the creation and merger of the male and female gametes, sperm and egg, thus combining the genetic characteristics of the two individuals parents; surge this combination of a being that differs genetically from their parents. The key points are: How is producing sperm and ova, "How grows and develops the embryo? And How nourishes the embryo until it can do by itself?
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