How many pairs of electrons do the two oxygen atoms in an oxygen molecule share with each other

Which flexible structure that supports the nerve cord and led to the backbone

Which event would lead to primary succession of a forest?

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.