Question

what is a major benefit of schooling?
○ reproduction
○ hydrodynamic efficiency
○ division of labor
○ aerodynamic efficiency

Explanation:

Schooling (fish swimming in groups) reduces water resistance for individual fish, which is a key adaptive benefit. Reproduction is not a direct benefit of schooling itself, division of labor is not a primary trait of fish schooling, and aerodynamic efficiency applies to air, not aquatic environments.

Answer:

hydrodynamic efficiency