Multiple Choice
Which of the following is an example of directional selection?
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1. Introduction to Biology
Natural Selection and Evolution
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In what ways have modern horses evolved from their ancient ancestors?
A
Modern horses have shorter lifespans compared to their ancient ancestors.
B
Modern horses have developed the ability to fly, unlike their ancestors.
C
Modern horses have a more diverse diet than their ancestors, which consisted mainly of meat.
D
Modern horses have larger body sizes and longer legs compared to their ancestors.
Verified step by step guidance1
Begin by understanding the concept of evolution, which is the process through which species undergo genetic changes over time, often resulting in physical and behavioral adaptations to their environment.
Consider the fossil record and how it provides evidence of the physical changes in horses over millions of years. Early ancestors of horses, like Eohippus, were small, dog-sized animals with multiple toes.
Examine the environmental changes that occurred over time, such as the spread of grasslands, which influenced the evolution of horses. As grasslands expanded, horses adapted to these new environments.
Analyze the anatomical changes in horses, such as the development of larger body sizes and longer legs. These adaptations helped horses run faster and cover greater distances, which was advantageous for survival in open grasslands.
Reflect on the incorrect statements in the problem: Modern horses do not have the ability to fly, and their diet is primarily herbivorous, not more diverse or meat-based compared to their ancestors.
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