4. Infer how scientists used knowledge gained from the I microscopic world to develop the three tenets of the cell
theory:
1. Cells are the basic unit of life.
2. All cells come from pre-existing cells.
3. All organisms are composed of one or more cells.

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.

The dense layer of connective tissue that surrounds an entire skeletal muscle is the

How to farmers could ensure that they only grow white flowers