Why Mike a scientist repeat any spearmint if he she didn’t make a mistake in the first one?

Which event would lead to primary succession of a forest?

Which feature of a human community is similar to a niche in a biological community

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.