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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.