5. The greenhouse effect, deforestation, and acid precipitation are a few problems confronting people in the twenty-first century. These problems indicate which of the
following is needed in human societies?
a. The development of auto industries in developing nations
b. A reduction in reforesting efforts in certain regions
c. Cooperation between nations to reduce pollution.
d. An increase in the worldwide production of oil

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.

d. groundwater flows through the subsoil and deposits minerals.

you should wear a lead protective shield when having teeth x-rays

hope i

-lavira : )