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Did you know?
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Did you know?
Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
Did you know?
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
Did you know?
The average office desk has 400 times more bacteria on it than a toilet.
Did you know?
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
![Examples of four letter formats: (A) block style, (B) modified block style, (C) modified block style ...](https://biology-forums.com/gallery/47/medium_665046_28_02_17_7_42_47_25896620.jpeg)
![Examples of four letter formats: (A) block style, (B) modified block style, (C) modified block style ...](https://biology-forums.com/gallery/47/medium_665046_28_02_17_7_54_44_2589934.jpeg)