Question

1. mammals who have a very short developmental period inside their mother’s body, followed by a second developmental period inside a special pouch of the mother that is made of skin and hair are ____. amphibians placental monotremes marsupials 8. most fish have __ skeletons. cartilage bony jawless toothlike 9. sharks have ____ skeletons. jawless suckerlike cartilage bony

Explanation:

1. Marsupials have a short gestation in - utero and then continue development in a pouch.
2. Most fish have bony skeletons, which provide support and protection.
3. Sharks have cartilage skeletons, which are lighter and more flexible than bony skeletons.

Answer:

1. marsupials
2. bony
3. cartilage