TASK DEFINITION: In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
PROBLEM: Question: What astronomical phenomenon is often comprised of remnants of the earliest material that formed in the solar system? Answer: meteorites

SOLUTION: Meteorites are often comprised of remnants of the earliest material that formed in the solar system.

PROBLEM: Question: What is the term for the exchange of genetic material between non-sister chromatids of homologous chromosomes? Answer: crossing-over

SOLUTION: Crossing-over is the term for the exchange of genetic material between non-sister chromatids of homologous chromosomes.

PROBLEM: Question: Acting like drawstrings to close off the alimentary canal, what regulates the passage of material between compartments? Answer: sphincter

SOLUTION:
Acting like drawstrings to close off the alimentary canal, the sphincter regulates the passage of material between compartments.