What is the probable sequence in which the following clades of animals
originated, from earliest to most recent?
1. tetrapods 2. vertebrates
3. deuterostomes 4. amniotes
5. bilaterians
a. 5-3-2-4-1 b. 5-3-2-1-4
c. 5-3-4-2-1
d. 3-5-4-2-1 e. 3-5-2-1-4