GIVING BRAINLIEST AND EXTRA POINTS PLZ HELP ASAP

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.

Which of the following is a common response to cell signaling?

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm