Porifera has no germ layer and Cnidaria has two of them.
4. One phylum on the table has more species than all the others. State the name of this phylum, and provide several different examples of species found in this phylum.
Maximum number of species is found in Arthropoda. Some species are crustacean, insects and arachnids. For instance butterflies, spiders, beetle, grasshopper, crabs etc.
5. Fish do not all have the same skeletal structure. Describe the differences among fish from the most primitive to more advanced types of fish.
The fish differ on the basis of their classes namely Agnatha, Chondrichthyes and Osteichthyes. The most primitive fish is Agnatha that is jawless fish and has no skeleton. An example is lamprey. Comparatively more advanced fishes are Chondrichthyes that have cartilage in skeleton. Even their jaw is made up of cartilage. An example is ray fish. Osteichthyes is most advanced fish having bony...
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