The inner leaflet of the human erythrocyte membrane consists predominantly of phosphatidylethanolamine and phosphatidylserine. the outer leaflet predominantly of phosphatidylcholine and sphingomyelin. although the phospholipids components of the membrane can diffuse in the fluid bilayer, this sidedness is preserved at all times. how?

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?