The presence of which of the following organelles or structures would most likely indicate that a cell is eukaryotic and not prokaryotic? a plasma membrane b ribosomes c nucleus d cell wall

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.

Which characteristics must an object possess in order to be considered alive?

The variation among individuals, on which natural selection acts