The book Lessons in Elementary Biology was written by author T Jeffery Thomas Jeffery Parker Here you can read free online of Lessons in Elementary Biology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Lessons in Elementary Biology a good or bad book?
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72, a). This process can be sufficiently well imitated by pushing in one side of a hollow india-rubber ball. The resulting embryonic stage —l^rcdm Ca.st.Mlh ^An Fig. 72. — Diagram illustrating the origin of the trochospheie from the gastrula. The ectoderm is dotted, the endoderm striated. A, gastrula, with enteron {£:ni) and gastrula-mouth {Gas/. Mth), and with the ectoderm and endoderm separated by the larval body-cavity or blastocoele {Bl. cccl). B, the gastrula-mouth has closed, the enteron ...[Ent) becoming a shut sac. c, two ectodermal pouches, the stomodajum (St. dm) and proctodeum (Pre. dm) have appeared. D, the stomodseum (St. dm) and proctodseum (Pir. dm) have opened into the enteron (Ent), forming a complete enteric canal with mouth (Mth) and anus (An). is known as the gastrula : its cavity is the enteron {£fit) and is bounded by the invaginated cells which now con- stitute the endoderm, the remaining cells, forming the outer wall of the gastrula, being the ectoderm. The two layers are continuous at the aperture of the cup, the gastrula- mouth or blastopore (Gast.
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