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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.
Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
![Olenoides erratus from the Mt. Stephen Trilobite Beds (Middle Cambrian) near Field, British Columbia](https://biology-forums.com/gallery/47/medium_12359_29_04_12_6_04_03.jpeg)
![Joseph Moore and His Family (1839), by Erastus Salisbury Field, reflects the emerging middle-class f](https://biology-forums.com/gallery/47/medium_375348_18_08_15_9_36_28_22295845.jpeg)