The tides of the ocean result from the gravitational pull on the Earth by the Sun and A
B
C
D
Answer is b. the moon

individual oxygen atoms are formed during photosynthesis.-c.

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme