Farmers in a certain region have noticed a decrease in the variety of crops that they are able to successfully grow in the region. This has impacted the number of crops that they are able to sell to consumers. Which of the following changes has most likely caused this change in biodiversity?

climate change and pollution

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 believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.