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active adapted adaptive radiation alleles amino acids animals annelids arthropods atoms behavior biology blood body bonds bone called capillaries carbon dioxide cavity cells characteristics chemical chromosomes cilia cnidarians coelom complex concentration contains cycle cytoplasm Darwin digestive echinoderms electron energy environment enzymes epidermis eukaryotes evolution evolutionary example feeding female fibers Figure fishes flatworms fluid fossil freshwater function gametes gene genetic genotypes gills glands glucose hormones humans hydrogen insects intestine invertebrates kidney larva layer living lophophore lungs male mammals marine membrane metabolism microtubules mitochondria molecular molecules molluscs mouth muscle mutations natural selection nematocysts nerve nervous system notochord organisms osmotic oxidation oxygen pair parasites Photograph phyla phylum plants plasma population pressure primitive produced proteins protozoa radiation reactions receptors reproduction secreted sensory shell skeleton sodium species sperm sponges structure surface tentacles tion tissue tube tubules types usually vertebrates worms