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There are more bacteria in your mouth than there are people in the world.
A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
![Peripheral veins used in intravenous therapy; A, forearm; B, dorsum of the hand; C, dorsal plexus of](https://biology-forums.com/gallery/47/medium_18099_26_09_12_4_30_04.jpeg)
![Varicosis. (a) Varicose veins develop due to the failure of valves in the superficial veins of the l](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_14_26_10024713.jpeg)