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.

Natural selection acts on populations through a specific trait. which statement must be true about that trait? question 6 options: the trait is passed on genetically to the next generation. the trait has little impact on survival. the trait is the same for all organisms. the trait is resistant to mutations.

Andesitic rocks have mineral compositions between those of and basaltic rocks. a. conglomerate c. granitic b. metamorphic d. organic select the best answer from the choices provided a b c d i need asap

Which statement about relative potential energy of electrons is correct? a. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 2 s orbital of the second electron shell. b. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 3 p orbital of the third electron shell. c. an electron in the 3 p orbital of the third electron shell has more potential energy than an electron in the 2 p orbital of the second electron shell.