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Author Question: In her first grade classroom Shaylynn teaches a science lesson using an informational text on ... (Read 580 times) |
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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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 human body produces and destroys 15 million blood cells every second.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.