What are the three types of reproduction that mammals do?

1. Sperm and Egg bind in uterus (e.g. humans, dogs, cats, etc.)

2. Eggs are laid (e.g. monotremes: platypus, echidna)

3. Two-pronged penis, Two lateral vaginas, Median vagina for birth (e.g. marsupials: kangaroos, koalas)