The figure below shows the number of predatory attacks per individual in water skater groups of different sizes. The information in the graph demonstrates which benefit of grouping? 
Definitions:
Nutritional Needs
the dietary requirements necessary to support life and health, including macronutrients such as carbohydrates, proteins, and fats, as well as vitamins and minerals.
Preschool Children
Young children, typically aged 3 to 5 years, who are in the early childhood stage, before beginning compulsory education at primary school.
Encopresis
A condition often related to chronic constipation in children, characterized by involuntary defecation.
Artificialism
The belief, often observed in children, that environmental features were made by people.
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