Why would sparse rainfall point to a sparser population? 1. There would be no water to drink.

2. The lower humidity would mean less disease.

3. It would be harder to grow crops with less rainfall.

4. People enjoy rainy weather.

I think it's 3, since there could be rivers or lakes nearby, and the other two dont point to sparser populations

Explanation:

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.