TLS Online TPP Program

#Question id: 9602


The legless condition that is observed in several groups of extant reptiles is the result of 

#Unit 9. Diversity of Life Forms
  1. their common ancestor having been legless.
  2. a shared adaptation to an arboreal (living in trees) lifestyle.
  3. several instances of the legless condition arising independently of each other.
  4. individual lizards adapting to a fossorial (living in burrows) lifestyle during their lifetimes.