Which tube is likely to contain digestive enzymes? (digestive system)

This is so important ugh its 25 points

What happens as electrons move along the chain of molecules known as the electron transport chain? they gain energy, which causes atp molecules to lose phosphate groups. they gain energy, which causes h *ions to join with oxygen to produce water. they lose energy, which is then used by the cell to make atp. they lose energy, which is then used to break down atp.

Why are some places regularly warmer or cooler than others in a given month