Final answer:
Modern humans and Neanderthals have similarities in their abilities and body structure, but also have differences in brain size and physical appearance. Neanderthals went extinct and did not include modern humans in their descendents. They overlapped with Homo sapiens for a period of time and may have interbred.
Step-by-step explanation:
Modern humans and Neanderthals share many similarities, including their ability to use tools, create art, and engage in social behavior. Both species also have a similar body structure, with two arms and two legs. However, there are also several differences between modern humans and Neanderthals. Neanderthals had a larger brain size and a more robust physique, with a pronounced brow ridge and a sloping forehead. Their descendents do not include modern humans, as they went extinct about 40,000 years ago. Neanderthals overlapped with Homo sapiens, our species, for a period of time and some evidence suggests that they may have interbred.