All of the living and non-living things in a particular area:

What is the importantence of the carbon and nitretan cycles in the environment

Describe the function of the endomembrane system? what organelles are involved?

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.