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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

Mating Common Buckeye Butterflies Mating Common Buckeye Butterflies
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The a helix, a common secondary structure in proteins The a helix, a common secondary structure in proteins
Prescriptions for common analgesics used in dentistry. Prescriptions for common analgesics used in dentistry.
Common Root Words and Combining Forms Cont Common Root Words and Combining Forms Cont
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Video: Role of complement proteins

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