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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

Species richness decreases with distance from the source pool. Species richness decreases with distance from the source pool.
Keystone species. Keystone species.
Species currently endangered in Canada include (a) the Burrowing Owl, Athene cunicularia; (b) Taylor Species currently endangered in Canada include (a) the Burrowing Owl, Athene cunicularia; (b) Taylor
Human Ear diagram Human Ear diagram
The fossil record of chimpanzees is sparse. The femur from Kikongo, Uganda (c) may represent a late The fossil record of chimpanzees is sparse. The femur from Kikongo, Uganda (c) may represent a late
Mechanism of Respiration in Human Mechanism of Respiration in Human
Video: Flexor reflex & Crossed extensor reflex

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