How does sugar cross the cell membrane to get into a cell

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun

Is there any solid scientific evidence that humans have been cloned?

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.