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Emerson: Could I have an application form? avanafil price nf âBut what we are saying is, that if you measure the types of species in a different way, using what is called âfunctional biodiversityâ â the role that species play within system â then there are marine areas where, although there are fewer species, they become individually much more critical to the effective health and functioning of that system. If one species becomes extinct then the whole system could collapse.â