Development Of Darwin's Theory

Question 1

What could Darwin not explain in his theory?

Answer 1

How variation occurred and the why the evolution of characteristics in fossils wasn’t gradual (lack of fossils discovered)

Question 2

What is the pentadactyl limb?

Answer 2

A limb that has five digits (fingers and thumbs). Amphibians, reptiles, birds and mammals share this characteristic.

Question 3

What does the pentadactyl limb show us about the evolution of different animals?

Answer 3

All of the animals with the pentadactyl limb are derived from a common ancestor.

The limb bone similarities show that the limb wasn’t designed for specific purposes but evolved for swimming, flying, walking etc.