Question

gradualism refers to evolution that occurs when and conditions are stable.

Explanation:

Gradualism is a theory in evolutionary biology. It posits that evolution occurs slowly and steadily over long periods of time. In the context of this question, when the environment (the external surroundings) and ecological (the relationships between organisms and their environment) conditions are stable, there is no sudden pressure for rapid evolutionary change. Instead, small, incremental changes accumulate over generations, leading to evolution through the process of gradualism.

Answer:

environment; ecological