No matter what the cell type, prokaryotic or eukaryotic, plant or animal, the forms a protective barrier between the exterior environment and the interior of the cell.
a. cell wall
b. cytoskeleton
c. cell membrane
d. glycoproteins

Are the layers of rock above and below the coal older or younger?

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.

Where does oogenesis take place ? seminiferous tubules fallopian tubes ovaries uterus