Question

Do most mammals have adaptations for internal fertilization and internal development of the fetus or internal fertilization and external development of the fetus?

Answer 1

internally

Step-by-step explanation:

In mammals, fertilization takes place internally in the protected environment of the ampulla of the oviduct, as opposed to external fertilization where sperm and egg meet outside the parent's body (e.g., as in fish, reptiles, amphibians and invertebrates).