Answer :
There are a number of problems that researchers face when comparing living primates to fossil hominin species. One of the biggest problems is that there is a lack of complete fossil records for many hominin species.
This means that researchers have to rely on fragmentary evidence to try to piece together an understanding of how these species lived and behaved.
Another problem is that the environment in which hominins lived was often very different from the environments in which living primates live today. This can make it difficult to directly compare the two. For example, a species of hominin that lived in a forested environment is likely to have behaved differently than a species of living primate that lives in an open savanna.
Finally, another problem that researchers face is that the fossil record is often biased towards certain types of hominins. For example, there are many more fossils of Homo sapiens than there are of other hominin species. This bias can make it difficult to get an accurate picture of the diversity of hominin species that once lived on Earth.
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