Select the correct answer In which of these fields is the concept of ecological efficiency not applicable?
OA
OB.
Oc
pisciculture (raising fish)
manufacturing jams and jellies
manufacturing steel furniture
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the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

i think its both a and b

i don't understand

explanation:

i don't understand your question