Calcium has twenty neutrons.
I have no clue on what you are talking about
Some produce greenhouses gases and promote warming of our planet through the greenhouse effect, while others reduce the amount of greenhouse gases promoting cooling of our planet.
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Antonie van Leeuwenhoek used single-lens microscopes, which he made, to make the first observations of bacteria and protozoa. His extensive research on the growth of small animals such as fleas, mussels, and eels helped disprove the theory of spontaneous generation of life.
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The fossil record provides evidence that organisms from the past are not the same as those found today, and demonstrate a progression of evolution. Scientists date and categorize fossils to determine when the organisms lived relative to each other.
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