development of ovaries in girls and testes in boys
The development of ovaries in girls and testes in boys is an example of a primary sex characteristic.
The correct answer is the development of ovaries in girls and testes in boys. Primary sex characteristics are the anatomical structures that are directly involved in reproduction. In females, the primary sex characteristic is the development of ovaries, which produce eggs (ova) and release hormones such as estrogen and progesterone. In males, the primary sex characteristic is the development of testes, which produce sperm and secrete testosterone. These primary sex characteristics are the foundation for the reproductive system and play a crucial role in sexual reproduction.
