Look at the photosynthesis reaction 6h2o + 6co2 -➔ c6h12o6 + 6o2. what do you think might be other factors that can affect the rate of this reaction?

Heat/temperature, and amount of sunlight. 

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass

The zone your looking for is the intertidal zone.