““4 Meet the astrocyte If you look at a tulip, you wouldn’t think it was an armadillo. Similarly, looking at a neuron, you wouldn’t think it was glia. But you might look at a whale and think it’s a fish, until you look at it closely and realize it has no gills and breathes through lungs. Then, you have a problem. Through genetic testing and excavations by paleontologists, we now know it likely originated as a land animal that took back to the sea and is related to hoofed animals like the horse. But before genetic testing and evolutionary biology, classification was based on appearance. This remains true for cellular classification.””
![“So what we can answer [as geneticists] is questions about biology, about biological ancestry. But to make any sense of that historically we have to contextualize it -- the archaeology, the linguistic pattern, even the climatology.” quote by Spencer Wells](https://sms4smile.com/quotes/img-quotes/38e/spencer-wells-33666_ancestry_so-what-we-can-answer-as-geneticists-is_3126654.jpg)
