Answer:
oxygen
Explanation:
all engage in oxygenic photosythesis (top equation), which means that they require water and release oxygen
Plants, algae, and cyanobacteria all release oxygen as waste that animals use to breathe.
The process of breathing involves two steps, i,e, inhalation, and exhalation. During inhalation, the oxygen gas is taken from the atmosphere, while exhalation involves the removal of carbon dioxide from the body.
Plants, algae, and cyanobacteria perform photosynthesis that produces oxygen as a waste product. This product is useful for the animals in their survival.
Therefore, plants, algae, and cyanobacteria all release oxygen as waste that animals use to breathe.
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