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genetics alleles human beings traits dna transcription replication genetic engineering proteins mendel period eon era fossils blood groups inheritance neurons evolution darwin miller oparin natural selection adaptations populations relationships translation human chromosomes mutations age ages plates continental drift hormones nerves nervous circulatory nutritional needs nutrients gas exchange stomach alveoli liver pancreas kidneys heart blood illnesses thrombosis research project poster rubric spinal cord brain snc cerebellum sinapse respiratory organisms ecosystems environment communities cloning rna stem cell tranlation gene therapy genetics engineering trophic chains trophic pyramids biogeochemical cycles cells organs tissues healthy diet