Refer to the figure.
Due to conservation efforts, this population of Seychelles warblers increased from 1959 to 1990. Following the ecological constraints hypothesis, in what year would you predict that helping behavior began to occur in this population?

Question

Refer to the figure.
 Due to conservation efforts, this population of Seychelles warblers increased from 1959 to 1990. Following the ecological constraints hypothesis, in what year would you predict that helping behavior began to occur in this population?

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The Answer of Refer to the figure.
 Due to conservation efforts, this population of Seychelles warblers increased from 1959 to 1990. Following the ecological constraints hypothesis, in what year would you predict that helping behavior began to occur in this population?

Refer to the Figure