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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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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

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There are more bacteria in your mouth than there are people in the world.

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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

Elephantiasis in a human leg. Elephantiasis in a human leg.
Large numbers of plant species can flower at once in this grassland in Kinsella, Alberta. Large numbers of plant species can flower at once in this grassland in Kinsella, Alberta.
Human tongue Human tongue
Horizontal, frontal (coronal), and sagittal planes in the human brain and a cross section of the ... Horizontal, frontal (coronal), and sagittal planes in the human brain and a cross section of the ...
Human Communication: The Basic Course, 14th Edition Human Communication: The Basic Course, 14th Edition
Human Population Growth Human Population Growth
Video: Role of transport in a cell

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