Why isn't a horse crab a mollusk?

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics?

Matthew decided he wanted to hike up mount everest. on his way to the top, it began to snow and the temperature dropped to -10°f. matthew forgot to wear a heavy jacket so his body began to shiver beyond control. in this case, matthew's body shivering is the to a drop in temperature. * 0 points reflex stimuli responce environmental facto

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes