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Author Question: Between ages 6 and 12, __________. A) all 20 primary teeth are lost and replaced by permanent ... (Read 272 times) |
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Everyone has one nostril that is larger than the other.
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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.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.