5. What is symbolic about the Dragon’s Cup and why was it added to the movie?

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

1. describe the structure and function of the specialized cells you observed in the video. 2. research the types of cells present in the kidney.

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.