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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Methicillin-resistant Staphylococcus aureus or MRSA was discovered in 1961 in the United Kingdom. It if often referred to as a superbug. MRSA infections cause more deaths in the United States every year than AIDS.
Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.
Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
![Hydronephrosis. Normal kidney (left) and kidney with hydronephrosis (right) are compared. Note the d](https://biology-forums.com/gallery/47/medium_14755_26_10_12_5_19_56_96622215.jpeg)
![Morotopithecus is the earliest fossil ape to show postcranial adaptations similar to those of the li](https://biology-forums.com/gallery/47/medium_274477_04_02_15_12_31_03_206091478.jpeg)