Correct Option: A

The tendency of an ecosystem to maintain its balance by regulatory mechanisms when disrupted, is known as Homeostasis. Homeostasis is the property of a system that regulates its internal environment and tends to maintain a stable, relatively constant condition of properties such as temperature or pH. It can be either an open or closed system. In simple terms, it is a process in which the body's internal environment is kept stable.
Entropy, a term used in Thermodynamics, is a measure of the "disorder" of a system. When a syst em receives an amount of energy q at a constant temperature, T, the entropy increase DS is defined by the following equation. DS = q/ T
Succession : The progressive replacement of one dominant type of species or community by another in an ecosystem until a stable climax community is established. Evolution is the change in the inherited characteristics of biological populations over successive generations.