Maribel places her backpack and lunch bag on a lab table where there are lab materials. what is the safest way for maribel to arrange the items?
both the personal items and the lab materials should be arranged neatly along the edge of the table.
both the personal items and the lab materials should be arranged in the center of the table.
the lab materials should be in the center of the table, and the personal items should be on the edge of the table.
the personal items should be off the table, and the lab materials should be placed neatly away from the edge of the table

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

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.