Question

Figure 20.10 Which animals in this figure belong to a clade that includes animals with hair? Which evolved first, hair or the amniotic egg?

Short answer

Rabbits and humans belong to a clade with hair, while the amniotic egg originated earlier since it is now lower on the evolutionary tree than hair.

Step-by-step solution

Introduction

A clade is a group of creatures that belong to the same monophyletic group and developed from the same common ancestor. A clade diagram depicts the development of a species and its separation from its forebears.

Explanation

Both rabbits and humans have hair and have a similar ancestry. They diverge at the same time. As a result, humans and rabbits represent the haired.

The amniotic egg is found beneath the hair, and animals having amniotic eggs are classified as Amniote, a group that includes fish, lizard rabbits, and humans. As seen in the evolutionary tree below, the amniotic egg originated first, while hair evolved later in rabbits and humans.

Conclusion

Rabbits and humans belong to a clade with hair, while the amniotic egg originated earlier since it is now lower on the evolutionary tree than hair.