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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.
Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.
Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
![A pedigree for a Y-linked trait. These traits are transmitted from males to all male offspring in ea](https://biology-forums.com/gallery/44/medium_6_25_01_22_7_07_09_441601371.jpeg)
![The eukaryotic cell cycle consists of two parts: (1) interphase and (2) mitosis followed by cytokine](https://biology-forums.com/gallery/44/medium_6_13_03_22_5_59_36_446232201.jpeg)