Male and female reproductive systems allow human reproduction. Fertilisation occurs when a sperm and egg join to form an embryo. An embryo develops into an unborn baby in the uterus during pregnancy.

(CBS12) — Kids are spending more time online and ... science book that includes one four sentence paragraph about the human reproductive system that reads, all females make eggs, and all males ...

Experts call for more research before parents panic—and offer ways to reduce exposure to microplastics in the meantime.