question: What sentence would provide a factual answer to this question: "Which is most considered a part of the skeletal system?"

answer: skeletal system is made of bones

question: What sentence would provide a factual answer to this question: "When fish travel in the opposite direction of flow they are going to"

answer: An example of a reproductive behavior is salmon returning to their birthplace to lay their eggs

question: What sentence would provide a factual answer to this question: "A way to reproduce is to"

answer:
An example of reproduction is laying eggs