A) \[{{O}_{2}}\]and food
B) Water and \[C{{O}_{2}}\]
C) Food and water
D) Shelter and shade
Correct Answer: A
Solution :
Water plants provide \[{{O}_{2}}\] and food because they are the producers they give \[{{O}_{2}}\] by the process of photosynthesis and water plants are eaten by the water animals as their food.
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