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Author Question: New telephone lines must be installed to connect 9 cities (A, B, C, D, E, F, G, H and J). Due to ... (Read 324 times) |
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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People about to have surgery must tell their health care providers about all supplements they take.