Concept:Successful egg incubation depends on physical conditions that support embryo development. Light is not among the essential requirements.
Explanation:Temperature is critical because it controls the rate of embryo growth and must be maintained steadily.
Humidity is needed to prevent excess moisture loss from the egg through evaporation.
Ventilation provides fresh oxygen and removes carbon dioxide produced by the developing embryo.
These three factors directly influence hatchability.
Light, on the other hand, does not affect the biological processes inside the egg.
Eggs can hatch successfully even in complete darkness.
Therefore, among the given options, light is the least important factor for successful incubation.
Answer:A. light