. Animal biology; Human biology. Parts II & III of First course in biology. Biology. FlG. 7. — Egg cell subdivides into many cells forming a sphere (morula) containing a liquid. A dimple forms and deepens to form the next stage (gastrula). they eat, breathe, feel, and move. They are called Pro- tozoans (Greek protos, first; soon, life). All other animals are composed of many cells and are called Metazoans (Greek meta, beyond or after). The cells composing the mucous membrane in man are shown in Fig. 8. The cellu- lar structure of the leaf of a many-celled plant is illustrated in Fig. i. (S

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. Animal biology; Human biology. Parts II & III of First course in biology. Biology. FlG. 7. — Egg cell subdivides into many cells forming a sphere (morula) containing a liquid. A dimple forms and deepens to form the next stage (gastrula). they eat, breathe, feel, and move. They are called Pro- tozoans (Greek protos, first; soon, life). All other animals are composed of many cells and are called Metazoans (Greek meta, beyond or after). The cells composing the mucous membrane in man are shown in Fig. 8. The cellu- lar structure of the leaf of a many-celled plant is illustrated in Fig. i. (See also Chap. I, Human Biology.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan Co.