In angiosperms, a zygote and endosperm form as a result of

Agermination.

Bdouble fertilization.

Cpollination.

Dseed dispersal.

Athey are an important food source to surface-dwelling marine organisms.

Bthey feed on tiny organisms living at the surface.

Cthey require sunlight to carry out photosynthesis.

Dthey cannot withstand the colder temperatures of deep water.