I think that the correct answer is reactants of photosynthesis.
Answer: If they are introduced to a new environment unlike their previous ones, which is wet, damp, moist, and humid areas, the population of toads in the area will most likely die, and the insects will become overpopulated (or rapidly grow)
Explanation: Because the food chain needs to stay stable!
The predator is the one putting the other in danger and the prey is the one IN danger