DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 1 Plants and animals are interdependent on each other. Plants give out oxygen which animals take in during respiration. By observing the interdependence we can say that

• A. Someday all the \[{{O}_{2}}\] will be used up by animals.
• B. Someday all the \[C{{O}_{2}}\] will be used up by plants
• C. The amount of \[{{O}_{2}}\] is increasing and that of \[C{{O}_{2}}\]is decreasing in our atmosphere.
• D. The level of \[{{O}_{2}}\] and \[C{{O}_{2}}\] in the atmosphere is kept constant.