Why does c. elegans make an ideal model for studying cellular differentiation?

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

Look at the photo of the leaf. which term best describes this leaf?

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment