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- 1. Define sessile. Name an invertebrate with a sessile adult stage. 2. Sponges have specialized cells called collar cells. Describe how collar cells are specialized for the functions they serve. 3. What is a nematocyst? What is its function? 4. How do coral reefs form? 5. How do free-living nematodes contribute to the carbon cycle? 6. Describe the basic body plan of a mollusk. 7. What are gills? What is their function?Describe the development of the notochord. Include the terms primitive pit, notochordal process, notochordal canal, neurenteric canal, notochordal plate, ectoderm, mesoderm, and endoderm in your descriptions. Include labeled diagrams in your description. With respect to the developing notochord, where is the cloacal membrane, allantois, embryonic ectoderm, embryonic endoderm, and embryonic mesoderm with reference to the developing notochord.What is mesoderm? Name an invertebrate with mesoderm.
- Part IlI: Discussion 1. How can you distinguish an unfertilized egg from a fertilized egg? 2. As development proceeds from zygote to morula, what happens to the: a. number of cells? b. size of cells? C. size of the cell mass? 3. Construct a table listing the three germ layers of the gastrula and the major body portions formed from each Jayer. 108 Lab 33What is the major difference between the notochord and the neural tube?What is the distinguishing characteristic of each stage in the embryonic development of the sea urchin? Embryonic Stage Distinguishing characteristic 1. zygote 2. morula 3. blastula 4. gastrula 5. pluteus
- What is the difference between a mesoderm and a mesoglea?Internal Anatomy of Female Grasshopper Describe the function of the grasshopper (internal). What are the similarities of the internal anatomy of the grasshopper to SPIDERS AND WORMS? What is the nature of the coelom and the circulatory system of the grasshopper?What are the four membranes associated with amniotic eggs? What is the function of each of these membranes?
- What are the differences between unfertilized and fertilized egg? Differentiate miolecithal, medialecithal and megalecithal. What organisms exhibit these features? What is the difference between isolecithal and telolecithal? How may these features affect the development of the organisms? What structures are derived from the ectoderm, mesoderm, and the endoderm?The notochord develops primarily from (a) ectoderm, (b) neural crest, (c) mesoderm, (d) endoderm.___________ removes webs between developing digits. a. Gastrulation c. Apoptosis b. Lactation d. Implantation