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Well if you were a researcher would you not want to?
They work in teams so that they don't skip over an important detail. Also, the more there are, the more they can research in a shorter amount of time. It's much more efficient to work as a group.
Many factors play a part why researchers would want to work in teams- largely to avoid human error. Like user gatorboy said, "so that they don't skip over an important detail" and "it's much more efficient to work as a group." Also, it is necessary to have accurate data by unbiased methods, and working in groups allows opportunity for new ideas.
Just remember teams need proper distribution and positive reinforcement!
think of it this way. why do societies have so many people? why dont we all just live alone? BECAUSE we'd die. we need others to survive. i suck at building but i'm awesome at healing, so i team up with someone who sucks at healing but can build me a home. get it?