Answer: Scientists who study evolution may want to know whether two present-day species are closely related. Evidence for evolution can be structural, genetic, or bio geographical. Fossil skeletons of horse relatives dating from various time periods. ... of fossils and living species may tell us how modern organisms evolved. so D
Explanation:
Answer:
They both provide structural support, but only insulin is a carbohydrate. They both store energy, but only glucagon is a carbohydrate. They are both hormones that regulate blood-sugar levels.