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Who were the first Americans, and when and how did they arrive in the Western Hemisphere?
Hormonal Cells
Cells that produce and release hormones, which are chemical messengers that influence many processes in the body.
Blood Supply
The circulation of blood within an organism, ensuring that nutrients, oxygen, and waste products are transported to and from cells.
Secondary Spermatocyte
A cell formed from the division of a primary spermatocyte during meiosis I, which will undergo meiosis II to produce spermatids.
Primary Spermatocyte
A cell that arises from the division of spermatogonia in the male reproductive process, undergoing meiosis to form spermatids.