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.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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The human body produces and destroys 15 million blood cells every second.
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Cyanide works by making the human body unable to use oxygen.
Conduction system of the heart.
Lymphatic system.
Parts of human nervous system
The Major Divisions of the Peripheral Nervous System
Relationship of the lymphatic system to the cardiovascular system.