Which of the following best compares the male and female reproductive structures of a gymnosperm?
a. Gymnosperms produce flowers, and the male stamens produce pollen that fertilizes the egg inside the female ovule.
b. Gymnosperms produce male cones and female cones, and the pollen from a male cone fertilizes the egg inside a female cone.
c. Gymnosperms have male sporangia and female archegonia, and spores fertilize eggs contained inside the embryo sac to form zygotes.
d. Gymnosperms exist as male and female gametophytes, and the male plant produces spores that fertilize eggs inside the female archegonia.