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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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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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Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.