The diagram shows that currently about 100 gigatons/year of carbon are moved from the atmosphere to vegetation on land. which process could decrease this number? a. reducing the amount of urban area in the world b. cutting down large areas of forests c. warming up the oceans d. increasing respiration rates

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?