There’s a wealth of detail that’s known about the way life exists in the biosphere that we’re simply going to turn our backs on by focusing on some basic principles. We’re also not going to talk about anatomy. Here in quick order are some of the anatomies you may have learned about in high school, and I’m giving them to you each with a three-second minute, a three-second showing to say we’re not going to do all this. And rather just to reinforce our focus, we’re going to limit ourselves to a very finite part of the biosphere.