NSES Content Standard E 
Science and Technology: Understanding about science and technology 
Grades K-4, page 138 

Scientists and engineers often work in teams with different individuals doing different things that contribute to the results. This understanding focuses primarily on teams working together, and secondarily, on the combination of scientist and engineer teams. 

Benchmark 1C The Nature of Science: The Scientific Enterprise
Grades K-2, page 15
In doing science, it is often helpful to work with a team and to share findings with others. All team members should reach their own individual conclusions, however, about what the findings mean.