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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.
![The Dall sheep, Ovis dalli, a mountain sheep of far northern North America, was the subject of one o](https://biology-forums.com/gallery/47/medium_33_22_09_11_9_35_55_18001324.jpeg)
![The Peary caribou is a relatively small and pale subspecies found in the tundra of far northern Nort](https://biology-forums.com/gallery/47/medium_27605_22_04_12_6_13_46.jpeg)