HEL PLEAS A student is building a model showing how living things are organized. Which pair of groups contains the greatest number of organisms?

genus and species

phylum and class

domain and genus

domain and kingdom

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.