Which of these does not represent a direct transfer of carbon 1.Air to trees
2.Giraffe to tree
3.Tree to Giraffe

giraffe to tree

Explanation:

a giraffe does not I've carbon to a tree

the sphincter muscles at the end of the digestive tract is the anus.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.