What is the composition of cell membrane?

In the ocean why are the greatest amount of primary producers found in the epipelagic zone and how does that affect biodiversity

What is a photon? a. part of a ribosome b. a light particle c. a carbon dioxide molecule d. part of a chloroplast b.a light particle

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days. true or false