Oxygen produced by photosynthesis is released and used by animals and plants in respiration. Animals depend (directly or indirectly) on food from photosynthetic organisms for growth and survival.

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"Chiapas rainforest" by Bild von bere von awstburg auf Pixabay [Public domain], via Wikimedia Commons:
https://commons.wikimedia.org/wiki/File:Chiapas_Rainforest.jpg