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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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.
More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.
![Erythroblastosis fetalis. (a) The condition occurs with an RH+ father and RH– mother. (b) First preg](https://biology-forums.com/gallery/47/medium_14755_16_10_12_12_29_18_9451500.jpeg)
![A medical records department. (Paper records are becoming obsolete, replaced by electronic records.)](https://biology-forums.com/gallery/47/medium_380792_19_05_16_2_39_01_235261537.jpeg)