Question

12.) what is given off as a waste product during stage 1 of photosynthesis - that most animals need to breathe?

Explanation:

In stage 1 of photosynthesis (light - dependent reactions), water is split. Oxygen is released as a waste product. Plants take in carbon - dioxide and water, and with the help of sunlight, they produce glucose and release oxygen. Animals need oxygen to breathe.

Answer:

Oxygen