An alga is an organism with the ability to perform oxygenic photosynthesis and obtain organic carbon with the energy of the sunlight.
All algae are considered protists according to some authors, however some species are also recognised as plants. There are a lot of types of algae, like green algae, red algae or glaucophytes.
Algae generally live in very humid environments or in water. Well, there are a few exceptions, some algae live in land.
There are algae that besides photosynthesis can feed heterotrophically, in which organic matter is transformed into nutrients (also organic) and energy. I guess that those nutrients are absorbed from the soil by the roots. And there are more than 30000 species of algae! and the algae produce most of the oxygen in the world.
Like they said in the video the protist eat other microorganisms.
Fun facts
And also the algae are used as enemies or decoration in some games like mario odyssey.
Some algae produce neurotoxins for defence.
The fossils from algae are used to make dynamites!
Some algae produce light.
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