Alveoli are structures in the respiratory system that allow gas exchange with the circulatory system which type of blood vessel would be most effective in this function?
Veins, because they contain only a tunica externa
O Arteries, because they contain only a tunica externa
O Arterioles, because they contain only a tunica intima
O Capillaries, because they contain only a tunica intima

answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.

c should be the answer