In photosystem II, P680 transfers an electron to pheophytin upon excitation by a photon. How is this electron replaced

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

During the process of two rails or sides break apart and attract new nucleotide bases to form a new and complete strand.

Which label identifies the part of the atp molecule that changes when energy is released in the cells of all living things