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...Plan for today motivation why is astronomy interesting a brief history of the universe relevant goals class logistics question to think about what substance molecule are people mostly made fat b water c dna d protein answer here molecules as atoms element if you could count number each type atom in your body which one would get most hydrogen carbon nitrogen oxygen e iron h o so then by weight different up numbers protons and neutrons thus have masses same mass electrons hardly any proton makes where do we come from when were our bodies assembled put together within past day g food ate century born sun earth formed billion years ago before was but after beginning they existed since...