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: The basic life functions of an organism are carried on by  
 (A) cells (B) nutrients (C) atoms (D) hormones

A: A
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Q: In animal skin tissue, cell division is responsible for  
 (A) growth and repair (B) sexual reproduction (C) obtaining energy (D) production of sex cells

A: A
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Q: Animals and plants need oxygen to live. Oxygen is released in photosynthesis. Which cycle includes photosynthesis?  
 (A) the carbon cycle (B) the nitrogen cycle (C) the water cycle (D) the rock cycle

A:
A
****