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: In 1971, the bones of an extinct flying dinosaur were discovered. This kind of discovery helps everyone learn more about  
 (A) impact of humans on Earth. (B) effect of gravity on animals. (C) history of animal species on Earth. (D) likelihood that dinosaurs will reappear.

Answer: C


Question: Which two processes occur during the life spans of all animals?  
 (A) hibernation and migration (B) growth and development (C) changing color and shedding fur (D) building nests and communication

Answer: B


Question: At an archaeological dig site, scientists, volunteers, and students collect items used by people living hundreds of years ago. To determine the history of the different people who may have lived at the site, which is the best method to classify the recovered items?  
 (A) by the type of item (B) by the size of the item (C) by the person who located the item (D) by the soil layer where the item was found

Answer:
D