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Author Question: The Curiosity rover has detected evidence of what kind(s) of chemical activity in Mars' soil? A) ... (Read 44 times) |
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.