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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

C

Explanation:

D shows the outer wall of the capillary and C shows the outer wall of the alveolar sac. (The pink cloud looking thing)

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.