What is true about double fertilization in angiosperms?
a. One sperm combines with the egg to form the zygote, and one sperm combines with the polar nuclei to form endosperm.
b. One sperm combines with the polar nuclei to form the zygote, and one sperm combines with the egg to form endosperm.
c. Two sperm combine with two eggs to form the zygote and endosperm.
d. Two sperm combine with a polar nucleus to form endosperm.