The Pentadactyl Limb: Evidence of Evolution and Adaptation

The video explains the pentadactyl limb, a limb with five digits found in all four-limbed vertebrates, indicating a common ancestor. It discusses how evolution has modified these limbs for different functions in various species, such as flying in bats, swimming in whales, digging in moles, and grasping in humans. The pentadactyl limb serves as evidence of evolution, showing gradual changes in limb characteristics to suit different uses.

What is the defining feature of a pentadactyl limb?

• It has three digits.

• It is found only in mammals.

• It has five digits.

• It is used exclusively for flying.

How has the pentadactyl limb adapted in bats?

• For swimming as flippers.

• For flying as part of their wings.

• For digging tunnels.

• For grasping and holding objects.

In which animal is the pentadactyl limb adapted for swimming?

• Mole

• Bat

• Human

• Whale

What is the primary function of the pentadactyl limb in moles?

• Flying

• Grasping

• Swimming

• Digging

What does the pentadactyl limb suggest about the evolution of vertebrates?

• They have no evolutionary significance.

• They evolved independently in each species.

• They all evolved from a common ancestor.

• They are only found in aquatic animals.