Which of these processes produces oxygen? a) burning coal for heat b) respiration in animals c) photosynthesis in plants d) operation of an acetylene torch

The correct answer is C. Photosynthesis in plants.

On earth the most oxygen is being got from plants in the ocean which are referred to as phytoplankton.

They uses carbon dioxide and sunlight to make their own food. It is during the process of photosynthesis where oxygen is being released from plants to the air.

This air is the one which is called oxygen and it is then be inhaled by animals and give out carbon dioxide which is used by plants and recycle continues.

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