Final answer:
Some bio anthropologists advocate for separate classification of chimps and humans due to differences in bipedalism, brain size, and behaviors. The family Hominidae includes both, with shared DNA, yet humans display unique traits like advanced tool use and abstract reasoning.
Step-by-step explanation:
Some bio anthropologists object to classifying chimps (chimpanzees) and humans in the same family, Hominidae, because they believe that significant biological and behavioral differences justify a separate classification. The family Hominidae includes the biological classification of advanced apes like chimpanzees, as well as humans. However, there are certain distinguishing features, such as bipedalism, brain size, and tool-making, that make humans unique. Early hominids like Australopithecus evolved about 3.9 million years ago and were some of the first to develop tool-making technology with larger brain sizes compared to other hominids. H. habilis, recognized as one of the earliest species in the genus Homo, had a brain size and manual dexterity that further distinguished the genus Homo from other hominoids.
The genus Homo first evolved about 2.8 million years ago and this evolutionary branch has several species including modern humans, Homo sapiens. While gorillas, orangutans, and chimpanzees share more than 97% of their DNA with humans, certain biological anthropologists argue for a distinct classification to highlight the evolutionary specificities, including our capacity for abstract thought and technological advances.