It's also not just that the loss of a species is bad. It's that some species are especially important, and it's not necessarily known which these species are:

It's also not just that the loss of a species is bad. It's that some species are especially important, and it's not necessarily known which these species are: https://en.wikipedia.org/wiki/Keystone_species https://en.wikipedia.org/wiki/Keystone_species