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The Frog as a Representative Animal
Protoplasm Cells and Tissues
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abdomen adult amphibians animals annelids antennae anus appendages aquatic arthropods attached birds blood vessels body wall bones burrows cavity cells Chap chitinous chromosomes ciliated cloaca coelom color contains crustaceans Ctenophora digestive tract dorsal duct eggs elongate embryo epidermis esophagus excretory external eyes feed feet female fertilization fibers fins fishes fossil free-living fresh waters frog gametes ganglia gastrula gill glands gonads head hind human inches individual insects internal intestine invertebrates jaws larvae later layers legs limbs living lungs male mammals marine membrane micronucleus mollusks molt mouth muscles nematocysts nephridia nerve cord nervous system nest notochord occur Order organs oviduct oxygen pairs parasitic pharynx Phylum plants posterior produce protozoans reproductive reptiles respiration salamanders secreted segmentation sensory shell skeleton skin slender snakes somites species sperm sponges structure surface tail teeth tentacles thorax tissues toads tube usually various ventral vertebrates wings worms