Final answer:
Oxygen gas is a main product of photosynthesis, vital for sustaining animal life through respiration.
Explanation:
Oxygen gas is one of the main products of photosynthesis. During photosynthesis, plants utilize carbon dioxide and water to produce glucose (C6H12O6) and oxygen as a byproduct. Oxygen is crucial for the survival of most forms of animal life, including humans, as it is needed for respiration.
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