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Did you know?
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.
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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.
![Jane Goodall pioneered the modern approach to studying primates in the wild, involving close-up obse](https://biology-forums.com/gallery/47/medium_269691_26_01_15_5_55_22_20430326.jpeg)
![Bronfenbrenner’s model of the ecological-systems approach to studying development. He suggested that](https://biology-forums.com/gallery/47/medium_6_31_05_15_8_20_41_219701596.jpeg)