When I got my teaching credential, I had to take a biology class because I hadn’t taken any biology as an undergrad (I also had to take government and P.E. as w

When I got my teaching credential, I had to take a biology class because I hadn’t taken any biology as an undergrad (I also had to take government and P.E. as well for the same reason—having aced the AP American History exam 17 years earlier in high school spared me from having to take an American History class). One of the things that sticks with me still is the somewhat inevitability about the formation of cell membranes given the characteristics of the atoms that compose the molecules that compose the membrane. I was left thinking that life like as we know it on earth might, in fact, be very much a likely outcome of any planet of suitable size, location and composition.