Answer: Animals depends on plants for food and plants depends on animals for carbon dioxide.
Explanation:
Plants are producers and they produce food (carbohydrates) by the process of photosynthesis.
Photosynthesis requires carbon dioxide, water and nutrients that they obtain from soil. The carbon dioxide used in this process is exhaled by animals.
The food produced by plants are used by animals.
This is how plants and animals are interdependent on each other.