The characteristics associated with the development of the organs and structures of the body that directly relate to reproduction are called

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The primary sex characteristics are the organs and structures directly related to reproduction, such as the testes and penis in males and ovaries and uterus in females. Secondary sex characteristics, on the other hand, are the characteristics that develop during puberty but are not directly related to reproduction, such as body hair, breast development, and changes in voice pitch. Menstruation refers specifically to the shedding of the uterine lining in females, and the secular trend refers to long-term changes in physical development over generations.

The Characteristics Associated with the Development of the Organs and Structures