Nearsightedness is corrected with concave lenses.
Farsightedness is corrected with convex lenses.
There are three kinds of blood vessels: arteries, veins, and capillaries. Each of these plays a very specific role in the circulation process. Arteries carry oxygenated blood away from the heart. They're tough on the outside but they contain a smooth interior layer of epithelial cells that allows blood to flow easily.
Answer:
They are surrounded by condensed interstitial stroma and vessels.
Answer:
engine exhaust, domestic heating, volcanic eruptions
Explanation:
