Final answer:
Anthropologists believe that the evolution of bipedalism freed up our hands to carry tools, providing a significant advantage to early humans.
Step-by-step explanation:
Anthropologists believe that one selective pressure for the evolution of bipedalism was that it freed up our hands to carry tools. The ability to carry and use tools would have provided a significant advantage to early humans, allowing them to perform tasks more efficiently and effectively. Examples of tools that early humans would have been able to carry include simple stone tools used for hunting and gathering.