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ability activities Amoeba amphibian animal animal's annelid ants appear arthropod behavior birds blind alleys body brittle star cells centers cephalic changes Chap characteristic chemical chicks ciliate coelenterate color complex compound eye conduction depends direction discrimination dominance earthworm echinoderm effect environment evidence excitation experience experimental fact factors feeding female fish flatworms function ganglia ganglion given habit important impulses individual insects intensity Jour kinesthesis learning light locomotion male manner manubrium maze modified mouth move movement muscles nerve nervous system nest normal object olfaction olfactory organism orientation pairs Paramecium pattern pecking pedicellariae planarian position posterior prey problem protoplasm Psychol rats rays reaction receptor response segments sensitivity sensory sensory systems side situation species starfish statocysts stimulation structure surface swimming tactual temperature tentacles tion tissue trials tube feet turn typical vertebrate vision visual wave length worm