GEOLOGY

Detailed explanation-1: -If a bat, an alligator, and a bird evolved from a common ancestor, what most likely can be concluded? They have similar anatomical structures. They live in the same part of the world. They are in the same biological classification.

Detailed explanation-2: -Homologous structures are similar structures that evolved from a common ancestor.

Detailed explanation-3: -Humans, chimpanzees, gorillas, orangutans and their extinct ancestors form a family of organisms known as the Hominidae. Researchers generally agree that among the living animals in this group, humans are most closely related to chimpanzees, judging from comparisons of anatomy and genetics.

Detailed explanation-4: -Darwin could compare only the anatomy and embryos of living things. Today, scientists can compare their DNA. Similar DNA sequences are the strongest evidence for evolution from a common ancestor.

Detailed explanation-5: -An example of homologous structures is the forelimbs of humans and bats. The forelimbs of both humans and bats have the same fundamental skeletal structure, derived from the same embryonic origin, and evolved from the same structures. Both of them are of mammalian origin.