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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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There are 60,000 miles of blood vessels in every adult human.