Question

which is the best hypothesis for the scientific question \how does light intensity affect the rate of photosynthesis?\ light intensity, co₂ concentration, and temperature are factors that determine the rate of photosynthesis. light intensity has no effect on the rate of photosynthesis. if the distance between the source of light and the plant is increased, the rate of photosynthesis will decrease. light intensity has an impact on the rate of photosynthesis.

Explanation:

A hypothesis is a testable prediction. The first option lists multiple factors instead of focusing on light intensity. The second option is too absolute. The fourth option is too vague. The third option, "If the distance between the source of light and the plant is increased, the rate of photosynthesis will decrease," is a testable prediction related to light intensity (as distance affects light intensity).

Answer:

If the distance between the source of light and the plant is increased, the rate of photosynthesis will decrease.