Heavenly bodies that travel around a planet are called satellites or moon which planet has no satellite or moon A. mars and venus
B. jupiter and venus
C. jupiter and mars
D. mercury and venus​

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.