Which of the following species is most closely related to humans?

Due to billions of years of evolution, we humans share genes with all living organisms. The percentage of genes or DNA that organisms share records their similarities. We share more genes with organisms that are more closely related to us.

Along with orangutans, gorillas, and chimpanzees, humans belong to the biological group known as Primates, and are classified with the great apes, one of the major groups of the primate evolutionary tree. Besides similarities in anatomy and behavior, our close biological kinship with other primate species is indicated by DNA evidence. In fact, humans share about 97% of their DNA with orangutans, 98.3% of DNA with gorillas, 98.6% of DNA with chimpanzees. Therefore, chimpanzees are genetically closest to humans. Both humans and chimps play, have complex emotions and intelligence, and a very similar physical makeup.

DNA also shows that our species and chimpanzees diverged from a common ancestor species that lived between 8 and 6 million years ago. The last common ancestor of monkeys and apes lived about 25 million years ago. Apes are more closely related to Old World monkeys (family Cercopithecidae) than to the New World monkeys (Platyrrhini) with both Old World monkeys and apes placed in the clade Catarrhini. Thus, humans share less share of DNA with monkey than with other great apes. For example, it was said that humans share 94% of DNA with baboons.