blood cells bring oxygen to cells and take carbon dioxide away.
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The world’s richest 20 percent of the population consume about what percentage of all goods and services in a given year?

Does indrect sunlight does not pose any danger to the skin

Which of the following is not a symptom of chronic fatigue syndrome a) pain in joints with swelling b) low-grade fever c) unexplainable muscle weakness or pain d) forgetfulness, irritability, and confusion