ANATOMY

Detailed explanation-1: -Which would indicate that a series of fossils represent the evolution of the horse? All of the fossils were found in the same layers of rocks as horse fossils.

Detailed explanation-2: -Fossils are the preserved remains or traces of animals, plants, and other organisms from the past. Fossils are important evidence for evolution because they show that life on earth was once different from life found on earth today.

Detailed explanation-3: -Homologous features If two or more species share a unique physical feature, such as a complex bone structure or a body plan, they may all have inherited this feature from a common ancestor. Physical features shared due to evolutionary history (a common ancestor) are said to be homologous.

Detailed explanation-4: -Anatomy and Embryology The similar construction of these appendages indicates that these organisms share a common ancestor. Another type of evidence for evolution is the presence of structures in organisms that share the same basic form.

Detailed explanation-5: -Homologous structures provide evidence for common ancestry, while analogous structures show that similar selective pressures can produce similar adaptations (beneficial features). Similarities and differences among biological molecules (e.g., in the DNA sequence of genes) can be used to determine species’ relatedness.