very best job differin 3 gel buy These assertions perpetuate the idea that the only relevant value is human value, that if a species has no "use" value for the human, it is expendable. Even more disturbing than the idea of wiping out every species of mosquito, is the notion that somehow thousands of species of plants are just as expendable because they have not proven to be of use as crops. First of all, those plants might well harbor as yet undiscovered medicinal or food value. Secondly, they are part of Earth's community of species and have the right to flourish.