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250 million adaptive radiation algae amoeba amphibians animal-like animals archaebacteria arthropods asteroid bacteria bacterium become bee fly birds bottleneck effect breed bryophyte called Cambrian Cambrian explosion cell wall characteristics cheetahs chemical classification closely related colonize common ancestor contain cytoplasm Darwin developed different species dinosaurs diversity divided Earth eggs environment enzymes eukaryote eukaryote cells evolution evolved example feed finch fish flowering plants founder effect fungi fungus genetic material genus grouping of organisms habitats Heinemann Library heterotrophs human hyphae inbreeding individuals insects kingdom known land leaflike living things Magnification approx mammals mass extinction meters million years ago Monera multicellular mushrooms mutation mycelium natural selection nucleus nutrients occur ocean organelles parasites percent Permian period photosynthesis phyla plant cells plasmids population predators produce spores protein protistans protozoans rain forests reproduce reptiles result scientists seeds sex cells similar single-celled slime molds structure survive tiny tissue vertebrates yeasts