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Last time in class we were talking about how a spider is not more/better evolved than a human or a whale vs a chimp etc... however, this got me thinking: i feel that we are the only species that could wipe out life if we chose to. many animals are becoming extict due to loss of habitat (because of our growth of habitat) and hunting (because we are/encourage poaching); many forests no longer exist due to deforrestation; etc. the only thing i could think of that is alive and could possibly "take us [humans] out" would be bacteria--however--we then would just develope an antibiotic to "take it out". 

I can't see any other living organism that can keep us in check. i mean if all of humanity decided that we needed to destroy life, i believe we could. what keeps us in check? our mind? our belief in a higher power? do we have an innate affinity for life that keeps us from doing this? hmmm....