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Compare the role of notochord in the early development of vertebrates and invertebrates.
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- The largest cycloneuralians are also the only ones with external fertilization. Which phylum is this? Explain the relationship between adult body size, mode of fertilization, and type of larval development in marine invertebrates.What is the destination of the notochord in vertebrates and in protochordates?Define notochord
- What is the function of the notochord? What organisms possess notochords throughout their lives and what organisms have notochords but degenerate in their early development?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.The notochord develops primarily from (a) ectoderm, (b) neural crest, (c) mesoderm, (d) endoderm.
- What are some differences between protostomes and deuterostomes?Distinguish two mechanisms by which flatworms supply yolk for their embryos. Which system is evolutionarily ancestral for flatworms and which one is derived?Determine in detail about four extraembryonic membranes of amniotic eggs of birds as well as other reptiles and to explain their functions.