In a bird species, the number of eggs per nest may vary, but it always oscillates between 3 and 4 eggs but never above or below. Studies have shown that 3 or 4 eggs are the optimal number (i.e. best) for this bird species based on its reproductive biology. What type of selection has caused this species to produce more or less the same number of eggs across generations
O Impossible to answer (lack of key information)
O Stabilizing selection
O Directional selection
O No selection is involved
O Disruptive selection