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I loved Friday's class, because the idea that all life on earth is related, even if extremely distantly, is one of the reasons I find Biology so fascinating. I think this is something we need to keep in mind as we consider the negative effect we as human beings are having on the earth. The earth is something all us living things share. Though there is probably life elsewhere, so far earth is the only life-supporting planet we know of, and probably the only planet that would support the type of life we have here. All living things (we know of) evolved here on earth. We are all related, if in few other ways, because of that. We have that in common. We only have one earth, one place that supports our type of life, and we need to protect it.