The gas that is given off by animals used what or whom to make food?

The gas given off by animals, primarily carbon dioxide (CO2), is used by plants to make food through a process called photosynthesis.

Here's how it works:

* Animals breathe in oxygen and breathe out carbon dioxide.

* Plants take in carbon dioxide from the atmosphere.

* Plants use sunlight, water, and carbon dioxide to produce glucose (sugar) and oxygen. This glucose is the plant's food source.

* Plants release oxygen into the atmosphere.

So, the carbon dioxide exhaled by animals is recycled by plants to create their own food, highlighting the interconnectedness of life on Earth.