question: What sentence would provide a factual answer to this question: "What happens when man moves into new environment but reproduction ceases to happen?"

answer: if all members of a species cannot produce offspring then that species will likely become extinct

question: What sentence would provide a factual answer to this question: "the nervous system sends observations in the form of electrical signals to what?"

answer: the nervous system sends observations in the form of electrical signals to the rest of the body

question: What sentence would provide a factual answer to this question: "Which is an inherited characteristic?"

answer:
the thickness of the parts of an organism is an inherited characteristic