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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.
Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.
Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.
Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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.
![Examples of USP labels Source: Courtesy of Novartis Pharmaceuticals Corporation and Mallinckrodt Pha](https://biology-forums.com/gallery/47/medium_46687_08_12_14_4_52_49_19512932.jpeg)
![Timing of teratogens. Vulnerability to teratogens is greatest in the embryonic period. Source: Moore](https://biology-forums.com/gallery/47/medium_351728_31_05_15_9_12_12_219982425.jpeg)
![Running time on 100-meter sprint for men and women master athletes increases with age. Source: Korho](https://biology-forums.com/gallery/47/medium_102911_16_06_15_7_18_43_220328.jpeg)