. Beginners' Zoology . e sides ofthe body; this causes the fish to sink. In the gar andother ganoids, the air bladder contains blood vessels, is con-nected with the gullet, and is used in breathing. Organsserving the same purpose in different animals are said to beanalogous. To what in man are the gills of the fish analo-gous ? Organs having a like position and origin aresaid to be homologons. The air bladders of a fish arehomologous with the lungs of man ; but since they havenot the same use they are not analogous. 122 BEGINNERS ZOOLOGY How does the tail of a shark or a gar differ from thetai
. Beginners' Zoology . e sides ofthe body; this causes the fish to sink. In the gar andother ganoids, the air bladder contains blood vessels, is con-nected with the gullet, and is used in breathing. Organsserving the same purpose in different animals are said to beanalogous. To what in man are the gills of the fish analo-gous ? Organs having a like position and origin aresaid to be homologons. The air bladders of a fish arehomologous with the lungs of man ; but since they havenot the same use they are not analogous. 122 BEGINNERS ZOOLOGY How does the tail of a shark or a gar differ from thetail of common fishes ? (Fig. 228.) Do you know of fishdestitute of scales ? Do you know of fish with whiplikefeelers on the head? (Figs.) Why are most fishes whiteon the under side ? Comparative Review. — (Copy table on one page or two facing pagesof notebook.) Is THERE A Head?A Neck? Method ofFeeding Digestive Organs and Digestion Reproduc-tion Senses Amoeba Sponge Hydra Starfish Earthworm Wasp Mussel Fish ^K^ ^ Ai -t. Fig. 229. —Drawing the Seine.
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