Explain the economic importance of horny and stony corals

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Answer the following in sentences:

  1. What are the criteria which delimit the phylum porifera to its classes?
  2. Explain the economic importance of horny and stony corals.
  3. What are the components of the exoskeleton of coelenterates? 
  4. What are the structural modifications of the pharynx in the classes of phylum aschelminthes?
  5. Differentiate the head regions of the free-living flatworm, fluke and tapeworm.
  6. What are the striking characteristics of this phylum which help you identify mollusks easily?
  7. What are the criteria that delimit phylum echinodermata to its classes?
  8. Differentiate the various classes of phylum arthropoda based on the following: body regions, respiratory organ, and appendages

Reference no: EM132734698

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