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.

[Q]: Which statement describes animal embryos?  
 (A) display all the features of an adult (B) represent the earliest stage of development (C) have the same number of cells as a fertilized egg (D) have half the number of chromosomes as an adult
[A]: B


[Q]: Which of the following is closest to the percentage of the total water on earth that is freshwater?  
 (A) 100% (B) 90% (C) 70% (D) 3%
[A]: D


[Q]: A student tosses a ball into the air. Which force causes the ball to fall back to the ground?  
 (A) gravity (B) magnetism (C) mechanical (D) friction
[A]:
A