By looking at the skeleton of a python a boa contricor and a

By looking at the skeleton of a python, a boa contricor and a legless amphbian, can you find evidence that would lead you to think the ancestor of those organisms had four legs? What is this evidence?

Solution

Fossil evidence suggests that snakes such as pythons and boa constrictors, might have evolved from burrowing lizards. Hunting in tiny burrows and tunnels favored these streamlined animals, with narrow pelvic bones and smaller legs. Eventually, legs became hindrance more than an advantage. There is dispute in the scientific community about whether snakes evolved from terrestrial lizards or marine reptiles, but the evidence clearly indicates that proto-snakes had legs.