Why do most earthquakes take place at tectonic plate boundaries?
a. the rock in the interior of a tectonic plate is stronger, so it does not deform.
b. earthquakes take place where the motion of tectonic plates transfers energy to rock.
c. earthquakes can only occur at places where magma can reach the surface and transfer energy to rocks.
d. earthquakes take place when one plate moves over another plate, which happens only at plate boundaries.

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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.