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in the image above of an alveolus, what is the identity of the two visible tissue layers labeled c and d.

a. c = inner wall of alveolar sac; d = outer wall of alveolar sac
b. c = inner wall of alveolar sac; d = outer capillary wall
c. c = outer wall of alveolar sac; d = outer capillary wall
d. c = inner capillary wall; d = outer capillary wall

Why can cancer in the lymph nodes (lymphoma) be particularly dangerous? a. the lymph node's ability to produce cancer-fighting lymphocytes would be compromised. b. the lymph node's ability to produce cancer-fighting lymph would be compromised. c. the lymph nodes produce lymph, which nourishes growing cancer cells. d. the lymph nodes produce chyle, which nourishes growing cancer cells.