I need help with this bio 20 question?

The abiotic factors that might cause annual fluctuations in the rate of photosynthesis in a grassland ecosystem are a. nitrate runoff from a nearby feedlot b. cold dry winters and a lack of moisture in the spring and summer c. overgrazing by livestock and a large deer population d. pasture rotation and increased... show more The abiotic factors that might cause annual fluctuations in the rate of photosynthesis in a grassland ecosystem are

a. nitrate runoff from a nearby feedlot
b. cold dry winters and a lack of moisture in the spring and summer
c. overgrazing by livestock and a large deer population
d. pasture rotation and increased deer hunting
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