Beginners' zoology . Fig. 12. — The Amceba taking Fig. 13.—AmiEBa, Dividing. PROTOZOA 13 surface. Its movements require energy; this, as in all ani-mals, is furnished by the tmiting of oxygen with the dioxide and other waste products are formedby the union;thesepassofi at the surface of the amoeba ardtaint the water with impurities. Questions.—Why will the amoeba die in a very small quantity ofwater, even though the water contains enough food? Why will It diestill quicker if air is excluded from contact with the drop of water? The amoeba never dies of old age. Can it be said
Beginners' zoology . Fig. 12. — The Amceba taking Fig. 13.—AmiEBa, Dividing. PROTOZOA 13 surface. Its movements require energy; this, as in all ani-mals, is furnished by the tmiting of oxygen with the dioxide and other waste products are formedby the union;thesepassofi at the surface of the amoeba ardtaint the water with impurities. Questions.—Why will the amoeba die in a very small quantity ofwater, even though the water contains enough food? Why will It diestill quicker if air is excluded from contact with the drop of water? The amoeba never dies of old age. Can it be said to be immortal? According to the definition of a cell {Chapter 7), is the amoeba aunicellular or multicellular animal? Cysts. — If the water inhabited by a protozoan dries up,it encysts, that is, it forms a tough skin called a return of better conditions it breaks the cyst andcomes out. Encysted protozoans may be blown throughthe air: this explains their appearance in vessels of watercontaining suitable food but previously free from pr
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
