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.
--------
Question: Which process in the water cycle returns water from the surface of Earth to the atmosphere?  
 (A) condensation (B) evaporation (C) precipitation (D) runoff

Answer: B


Question: Organisms contribute to the water cycle mainly through the process of  
 (A) irrigation. (B) evaporation. (C) precipitation. (D) transpiration.

Answer: D


Question: Which of these provides the best evidence that the environment of Earth has changed over millions of years?  
 (A) active migration of sand dunes (B) polished appearance of rock surfaces (C) marine fossils found in mountains (D) bones of animals found on the ground

Answer:
C