What happens when planaria grow, heal and regenerate after being cut

What molecule contains an organisms genetic material, passed down from parents to their offspring

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

What are some possible consequences of preventing prescribed burns and natural wildfires