1. Why do you think most invertebrates are capable of asexual reproduction whereas most vertebrates are not? 2. Compare and contrast the reproductive systems (both microscopically and macrodissection) of Ascaris and Lumbricus? Identify two similarities and differences. What factor(s) might be the main reason for the differences? 3. Compare and contrast the reproductive systems of the frog and the rat? Identify two similarities and differences. What factor(s) might be the main reason for the differences?.