I’m having trouble writing a few paragraphs explaining, as you would to a 6th grader, how the elements of the universe, such as those in our body, were created and dispersed. Start your paragraph like this: “When the universe began only hydrogen and helium were present …”. Since you’re writing this for a 6th grader to be able to understand, make it accurate yet exciting and interesting so it would keep her/his attention.
You may want to have a look at a http://astronomy.nmsu.edu/the-elements-of-life-mapped-across-the-milky-way-by-sdssapogee/
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