Which of the following is an example of an abiotic factor changing a biotic factor of an ecosystem? Hint biotic and abiotic must be in answer
1) A dam changes the flow rate of a river
a) A dam changes the flow rate of a river
b) Plants produce O2 during photosynthesis
c) Spring phytoplankton bloom occurs from upwelling and nutrient mixing
d) Planting trees reduces soil erosion