The scientific theory of evolution is supported by different types of evidence. The diagrams below show the skeletons of two different animal species. How does comparing the skeletons of these animals provide support for the scientific theory of evolution?

According to fossil records, the horses that lived 50 million years ago were much smaller, weaker and slower than modern horses. Which process is most likely responsible for the changes that have led to the increased size, strength, and speed in horses?

The diagram illustrates an embryonic stage of two organisms. Which of the following can be determined by observing the embryos shown in the diagram? 

Scientists have found evidence that about 2.4 million years ago a gene regulating jaw muscles mutated and may have led to the more graceful human jaw we see today. The diagram below shows the skulls of 3 hominid species.

Which statement below most closely explains the link between jaw size and hominid evolution? 

Scientists are studying the evolutionary history of a group of plants in the United States, and they developed an evolutionary tree, as shown.

Which statement can be inferred from the evolutionary tree?

Scientists are studying the evolutionary history of a group of plants in the United States, and they developed an evolutionary tree, as shown.

What information about the organisms best helps the scientists to determine the evolutionary relationships among them?