How do vertebrates differ from invertebrates?

Which class of vertebrates has a cartilaginous skeleton?

Which of the following vertebrate groups uses external fertilization?

Which vertebrate class has hair & feeds young with milk?

Which vertebrate class lays amniotic eggs with a leathery shell?

Which mammal group lays eggs?

Which vertebrate class has thin, moist skin & lays eggs with no shell?

Which vertebrate group has a 4-chambered heart, hollow bones, & lays amniotic eggs w/ a hard shell?

What is the advantage of an amniotic egg?

How are amphibians similar to fish?

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