8. How does the Convention on International Trade in
Endangered Species (CITES) help to reduce extinction?

CITES work by subjecting international trade though Licensing System.

Explanation:

Approximately, 30000 species of Plant and 5800 animal species are under Protection by CITES against over exploitation through international trade. Flora and Fauna species are grouped in three appendices depending on how much they are threatened by International trade. CITES works by subjecting. To certain control, CITES used to subject international trade of specimen of certain species. There are applicable licensing system which is controlled or monitored by management authorities and scientific authorities. Role of Scientific authorities to advise effect of trade on species status.

All Export, Import, re export of these species should be authorized by Licensing system

Appendix I species are endanger of extinction and their trade permitted on exceptional situation.

Appendix II species are not in endanger of extinction but their trade need to be controlled to avoid species utilization that are unsuited with their survival

Appendix III contain those species which are endangered in at least one country and these are asked with CITES parties for helping in controlling their trade

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

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