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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.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

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Thyroid conditions may make getting pregnant impossible.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

The degree of glacier retreat at Glacier Bay, Alaska, since 1794. The degree of glacier retreat at Glacier Bay, Alaska, since 1794.
Two equivalent ways of drawing a phylogeny Two equivalent ways of drawing a phylogeny
First-degree burn. First-degree burn.
Third-degree burn. Third-degree burn.
How to solve first-degree equations (Part 1) How to solve first-degree equations (Part 1)
Lone-parent household income and the degree of vulnerability Lone-parent household income and the degree of vulnerability
Video: Introduction to Spirometry

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