What is the definition of habitat preservation

Which feature of a human community is similar to a niche in a biological community

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.

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic