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Author Question: Extrusive igeneous cooled and hardened ________ the Earth's surface, resulting in ________ grained ... (Read 63 times) |
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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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.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.