You are given a science question (hard-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.

Which physical characteristic of Earth is similar to a physical characteristic of the Moon?  
 (A) its climate (B) its great seas (C) its atmosphere (D) its mountain ranges
D

The respiratory system cannot deliver oxygen to the cells of the body, nor can it remove carbon dioxide, without which two body systems?  
 (A) muscular and nervous (B) digestive and muscular (C) cardiovascular and nervous (D) cardiovascular and muscular
D

A food chain is shown. Sunlight -> Grass -> Rabbit -> Snake. What is the abiotic factor in this food chain?  
 (A) Sunlight (B) Grass (C) Rabbit (D) Snake

A