5.2.1 What Can Earth Life Tell Us About ET Life?

What can life on Earth tell us about ET life? Figuring out how life DID emerge on Earth may be the most informative way to figuring out how life DOES emerge on other planets. The intimate connections between physics, chemistry and biology on Earth should be the same as they are elsewhere. The basic idea is that the closer you get to the features characteristic of the origin of life on Earth, the closer you are getting to universal features.