Stem cells are what allow planaria to grow and regenerate as the stem cells can change into any of the cells that make up the planaria.
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This is a true statement. An electron closer to the nucleus would be difficult to remove because the electronegativity of the atom would be greater.
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The sample mean is obviously different from the population mean, but tests of significance must be done to determine if the difference is statistically significant. The difference could possibly be attributed to chance or to sampling error.
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