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Natural Selection and Evolution
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amino acid amino acid sequence ancestor animals artificial selection biochemical function biology birds birth of organisms Cambrian explosion Chapter chromosomes closed framework coding sequence contain crea Darwin's theory defects DG pathway different organisms distinct creature distinct organism DNA sequence earth enzymes eukaryotic evolutionary change evolutionary theory evolved existing exons expected mean length explain fossil record gene duplication genetic pathway genome geological improbable independent birth individual variations introns invertebrates isms large number lead living organisms mammals mechanism million molecules multicellular organisms mutations natural selection nucleotides number of genes occur organismal evolution organs and appendages origin outgrowths phylum possible primordial pond probability produce prokaryotic punctuated equilibrium random DNA sequence random sequence recombination reptiles scenario seed cells sequence pool set of genes similar species speciation splice split genes stop codons teins tion transposons tures unique body unique creatures unique genes unique organisms varieties vertebrates