Question

which environmental change caused all populations of the biotics factors (algae, mosquito larvae, minnow, trout, and heron) to increase?

• increase in runoff
• drought in the area
• pollution from the factory
• introduction of a non - native species

Explanation:

• Drought reduces water/resource availability, decreasing all populations.
• Factory pollution poisons organisms, lowering their numbers.
• Non-native species often outcompete natives, reducing native populations.
• Increased runoff carries nutrients (e.g., fertilizers) into water, boosting algae growth. More algae feeds more mosquito larvae, which feed more minnows, which feed more trout, which feed more herons, increasing all populations in this food chain.

Answer:

increase in runoff