What do scientists think about the common ancestor of whales and hippos?
a
The animal lived in water.
b
The animal had two limbs.
c
The animal is still alive today.
d
The animal lived millions of years ago.
1 answer
The correct answer is (d) - The scientists believe that the common ancestor of whales and hippos lived millions of years ago, and that it was a land-based mammal that eventually returned to the water. There is no evidence that the common ancestor is still alive today. It is also believed that this ancestor had four limbs, although over time, the descendants of this species evolved to have different numbers and shapes of limbs.