A. true b. false in passive transport, molecules can only move with the net movement of molecules down their concentration gradient

This statement is true. Only active transport can move molecules up a concentration gradient using energy. Passive transport on the other hand, uses no energy and occurs naturally. Therefore molecules can only move a concentration gradient.

Passive transport requires no energy so moves with the gradient, not against it (active transport) so it is true

The 3 steps are vasoconstriction, temporary blockage of a platelet plug, formation of a fibrin clot better known as coagulation.