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adapted alleles amino acids apomictic apomictic species aquatic areas arose bacteria became become biomes birds bisexual body called cell Cenozoic changes characters chemical chiefly chromosomes climates combinations complex compounds Cretaceous crust crustal distinctive dominant earth ecological environment enzyme evolution evolutionary burst evolved example existence extinct ferns fish flowering plants fossil galaxy gametes gene genetic genus geologic green algae groups haploid higher plants hybrids hydrogen individuals insects isolated land large number larvae lineages living things mammals marine meiosis metazoan million years ago molecules mosses mutations natural selection nucleic acids number of species occur ocean organisms origin Paleozoic parent photosynthesis phylogenetic lines placoderms planetesimals plants and animals polyploid populations pre-life predators primeval primitive probably produce progeny proteinoids proteins range reactions reproduction reptiles result segment selection pressures spherules stages stars structure subclimax succession temperature terrestrial theory therapsids tion trees tropical types unicells vertebrates