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Author Question: Between 1850 and 1860 the prices of slaves ____ than the price of cotton. a. increased more b. ... (Read 35 times) |
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.