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Which primary germ layer gave rise to the cells that eventually became the central nervous system?

Renin is released in response to .

During what process does the amnion envelop the embryo?

Transmitted from mother to child

Sperm must first complete  to enable the fertilization of an oocyte.

The timing of puberty can be influenced by which of the following?

Which explanation best describes why plasma proteins can function as buffers?

Spermatogenesis takes place in the .

Rickets results in improper bone development in children that arises from the malabsorption of calcium and a deficiency in .

 Cleavage produces daughter cells called .