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The number of nucleons in a nucleus is the number of. The emission and absorption spectra of different elements provides evidence for the existence of. The nucleus of an atom contains protons.he number of nucleons in a nucleus is the number of. The emission and absorption spectra of different elements provides evidence for the existence of. The nucleus of an atom contains protons.
describe the hypothesis that says that RNA is the genetic material that stores information in living things on early Earth thomas cech and sidney Altman discovered that RNA can catalyze their own replication and synthesis through ribozymes