The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
Water striders serve as a model organism for the study of sexual conflict between males and females.
Colostomy. Alternate versions of colostomy are illustrated, each of which creates one or more new op
Nurses, here to serve
(a) Homologous traits are similar due to shared ancestry. (b) Analogous traits (bats’, birds’, and f