1. Name a protein that carries vital materials throughout the body. 2. Explain the specific function of this protein.

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Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

Pepsin is an enzyme in the stomach that breaks polypeptides into amino acids. pepsin functions best at a ph of around 1.5. what would be the most likely result if the ph of the stomach were increased to 5

Parasitism could be considered a form of which of these types of relationships? -mutualism -commensalism -predator-prey -mimicry