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Aplant has an egg with 34 chromosomes how many chromosomes does a leaf cell of that plant have

Secondary pollutants are more harmful than primary pollutants. select the best answer from the choices provided ot of

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.