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Author Question: The concept of natural selection was proposed by a. Charles Darwin. b. James C. Chatters. c. ... (Read 886 times) |
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.