Question

Historically, snakes had legs and now they are vestigial structures in certain species

a-true
b-false

Answer 1

Snakes are legless reptiles that have evolved from four-limbed ancestors. While most snakes do not have any legs, some species like boa constrictors have vestigial hindlimbs called pelvic spurs.

Step-by-step explanation:

Snakes are legless reptiles and have descended from either burrowing or aquatic lizards over 100 million years ago. While most snakes do not have any legs, there are exceptions such as boids (e.g., boa constrictors) which have vestigial hindlimbs in the form of pelvic spurs. These vestigial structures are residual parts from a past common ancestor and are no longer functional. They are evidence of evolution, showing that snakes have evolved from four-limbed ancestors.