Production of more food--the system allowed for more food to be produced which fed the workers in an industrial economy.
The 'four-field system' rotates crops between the 4 fields no longer needing to keep one empty because one of the crops would replenish the field with nutrients while the others take nutrients away from the fields. <span />
As the intensity of light increases, the rate of photosynthesis will increase as long as all other needed factors are involved
Right of blood.
I hope this helps. :)