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amino acids animals astronomers Atomic structure bacteria Big Bang biologists black hole body Bohr cause cell theory century charge Chemical bonding chromosomes Copernicus Crick Dalton Darwin decay developed discovery disease double helix Earth effect Einstein elec electricity electromagnetic electrons elements emitted energy evolution evolutionary example exist experiments fact Faraday force fossil galaxies Galileo genes gravity happens heat hominid Homo Homo erectus human hydrogen idea kind known laboratory Lavoisier living organisms Lyell magnetic mass mathematical matter mechanics Mendel messenger RNA million modern molecules motion moving nature neutrons Newton nucleus objects orbit oxygen particles called Pasteur Pavlov physicist physics Planck plants plate Plate tectonics produce protein protein molecules protons quantum theory quarks radiation radioactive relativity result ribosome scientific scientists shell showed solar system space species speed of light stars subatomic particles substance tion traits universe viruses waves