WILL GIVE 30 POINTS 1. Discuss the role of the immune system.
2. Explain how the skin functions as the first line of defence against disease.
3. Discuss the role of B and T cells in an immune response.
4. Discuss the relationship between vaccination and immunity, between natural and acquired immunity.
5. Describe what occurs in an allergic reaction and in a transplant rejection reaction.
6. Explain the antigen-antibody reaction.
7. Describe one immune system disorder.

Aparent with freckles is crossed with a parent without freckles. the punnett square shows the possible genotypes and phenotypes of the offspring. which statement accurately describes the probability of phenotypes? a. the offspring are more likely to have freckles. b. the offspring are more likely to have no freckles. c. the likelihood of the offspring having freckles and not having freckles is the same. d. the likelihood of the offspring having freckles and not having freckles cannot be determined.

Polar zones are cold and tend to be dry because of a pressure system of cold. low high

10 points a population of mice have tails. over time those mice with either really short tails or really long tails have a higher rate of survival. this will probably lead to what type of selection? a. disruptiveb. directionalc. stabilizingd. evological