Examlex
According to Piaget, the first period of cognitive development is the _____ period, which lasts from birth until about age 2.
Breast Bud
A breast bud is the initial lump that appears under the nipple as the first sign of puberty in girls, indicating the beginning of breast development.
Testosterone
A steroid hormone that plays a key role in the development of male reproductive tissues, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.
Estrogen
A group of steroid hormones that play a crucial role in the development and regulation of female reproductive and sexual functions.
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