Figure P20.4. Optimal survival when there is no competition. The shaded area shows the combinations of survival v_A, v_B that are possible (v_A² + v_B² ≤ 1); the lines show contours of average survival (thick lines at intervals of 0.1). (A) Eggs are laid equally in A, B; (B) eggs are laid on A, B in proportions 7:24.

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