Generate a sentence that answers this question: "What have a negative impact on the environment?".

Answer: landfills have a negative impact on the environment

Generate a sentence that answers this question: "cycles of day and night occur once per".

Answer: cycles of day and night occur once per day

Generate a sentence that answers this question: "Which of these could contribute to a species' demise?".

Answer:
the decrease of something required by an organism has a negative impact on that organism 's survival