What is a pigment ranging in color from yellow to red; in capturing the sun's light energy for use in photosynthesis

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

During convection, less dense fluid rises and denser fluid sinks.