Assuming that all of the following events occur, what is the correct sequence in which the following
processes occur during the development of an individual animal?
1. gastrulation
2. metamorphosis
3. fertilization
4. cleavage
a. 4, 3, 2, 1
b. 4, 3, 1, 2
c. 3, 2, 4, 1
d. 3, 4, 2, 1
e. 3, 4, 1, 2