. Beginners' Zoology . Bylashing the water, theycaused a stronger cur-rent (Fig. 25) than pro-tozoans living singlycould cause. Thus theyobtained more food andmultiplied more rapidlythan those living habit of workingtogether left its impresson the cells and was trans-mitted by inheritance. Cell joined to cellformed a ring; ringjoined to ring formed a tube which was still more effective thana ring in lashing the water into a current and bringing fresh food(particles of dead plants and animals) and oxygen. Few animals eat sponges; possibly because spicules, or fibres,are found througho
. Beginners' Zoology . Bylashing the water, theycaused a stronger cur-rent (Fig. 25) than pro-tozoans living singlycould cause. Thus theyobtained more food andmultiplied more rapidlythan those living habit of workingtogether left its impresson the cells and was trans-mitted by inheritance. Cell joined to cellformed a ring; ringjoined to ring formed a tube which was still more effective thana ring in lashing the water into a current and bringing fresh food(particles of dead plants and animals) and oxygen. Few animals eat sponges; possibly because spicules, or fibres,are found throughout the flesh, or because the taste and the odourare unpleasant enough to protect them. Small animals sometimescrawl into sponges to hide. One sponge grows upon shells in-habited by hermit crabs. Moving of the shell from place to placeis an advantage to the sponge, while the sponge conceals and thusprotects the crab. Special Report: Sponge Fisheries. (Localities; how spongesare taken, cleaned, dried, shipped, and sold.). Fig. 32. — Microscopic plan of ciliated cell lining the chamber has a nucleus,a_ whip-lash, and a collar around base ofwhip-lash. Question: State two uses ofwhip-lash. CHAPTER IV POLYPS (CUPLIKE ANIMALS)
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