instruction:
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 an electric motor, electrical energy is converted into  
 (A) mechanical energy. (B) chemical energy. (C) thermal energy. (D) light energy.
answer:
A


question:
Which substance do all living things require to survive?  
 (A) blood (B) water (C) carbon dioxide (D) organic soil
answer:
B


question:
The discovery of a fossilized animal with teeth, a long bony tail, and feathered wings helped to establish which evolutionary sequence?  
 (A) rodents to bats (B) reptiles to birds (C) aquatic organisms to land-based organisms (D) invertebrates to flying organisms
answer:

B