Biology of Animals |
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adapted adaptive radiation adult amino acids amphibians animals annelids anus aquatic arthropods asexual behavior birds blood body plan body wall called canal carbon cavity cells characteristics choanocytes chromosomes ciliated cnidarians coelom colony complex coral cycle cytoplasm digestive dorsal echinoderms eggs electron embryo energy environment enzymes epidermis evolution evolutionary example feeding female fibers Figure fishes flatworms fluid fossil freshwater function gametes gene genetic gills glands habitats hormones humans hydrostatic skeleton insects intestine invertebrates kidney larva layer leuconoid living lophophore lungs male mammals mantle marine medusa membrane mesoderm metabolism metazoa molecules molluscs mouth muscle nematocysts nematodes nerve nervous system organs oxygen pair parasitic pharynx Photograph phyla phylum plants plasma polyp population prey primitive produced protein protozoa pseudocoelomate radiation reproduction reptiles secreted sensory shell skeleton species sperm sponges structure surface swimming tentacles tion tissue tube tubules usually ventral vertebrates worms