Answer:
B. efficiency reproduction
C. division of labor
Explanation:
Gathering into bigger groups of the same species can bring many benefits to animals:
- Safety from predators: the effectiveness of vigilance can increase, large numbers of animals can also confuse or intimidate predators.
- Access to mates: herding brings together potential mates
- Help in finding food: The same that happens with predators, a larger number of eyes is more likely to find more food
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