The first “plant” to ever generate oxygen and since there are many, we can’t exactly say
which one … but one did start the parade today that we know as pond scum. They’ve been around 3.5 billion years, and their fossils are everywhere reflecting a time when the waters were more toxic than today (but still are in places like Shark Bay, Australia).
Oxygen does not just “happen in the air.” This is the agent that set the stage for all life and like other algae forms is not much studied. Aggregated they can make amazing plants: assisting coral (animals) live and kelp for example. As kelp created (and still does, sold by the Haida commercially) food for the Indigenous Peoples it too, might have been the “vegetable” that aided the Indigenous migration down the coast of the Americas. We owe the World we know today to algae and all the other plants that followed.
https://www.nature.com/articles/srep20557
https://en.wikipedia.org/wiki/Algae
https://en.wikipedia.org/wiki/Shark_Bay
https://en.wikipedia.org/wiki/Cyanobacteria
https://ucmp.berkeley.edu/bacteria/cyanointro.html
https://www.biologyonline.com/dictionary/cyanobacteria
https://fdc.nal.usda.gov/fdc-app.html#/food-details/168457/nutrients
What Is the Main Difference Between Seaweed and Kelp? (oceansbalance.com)
Algae comes in many forms. The one that is an animal but relies on algae is:
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