The reproductive organs of gymnosperms are found

An easy way to calculate the amount of energy available at each level is to what?

Diffusion and osmosis are forms of passive transport

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