question: What sentence would provide a factual answer to this question: "Which event can lead to the human caused change of an environment?"

answer: if the amount of available food and water decreases in an environment then animals may leave that environment to find food and water

question: What sentence would provide a factual answer to this question: "In a plant such as a cactus, water is held within"

answer: a plants require water for to grow

question: What sentence would provide a factual answer to this question: "as rainfall increases in an area, electricity will be less and less available for"

answer:
as the amount of rain increases in an environment , available sunlight will decrease in that environment