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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The horizontal fraction bar was introduced by the Arabs.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
![Internal view of the heart illustrating the heart chambers, heart layers, and major blood vessels as](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_22_08_851775.jpeg)
![Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones](https://biology-forums.com/gallery/47/medium_12359_26_01_13_3_56_03.png)