Instructions: You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
Input: If the environment in an area is destroyed, a new community of organisms sometimes takes the place of previous communities. The introduction of a new community of organisms is known as
(A) evolution. (B) adaptation. (C) biological diversity. (D) ecological succession.
Output:
D