Algae (singular alga ) is an informal term for a large and diverse group of photosynthetic eukaryotic organisms.- Algae
Eukaryotic organisms are characterized by the presence of a membrane-bound cell nucleus and contain additional membrane-bound compartments called organelles (such as mitochondria in animals and plants and plastids in plants and algae, all generally considered to be derived from endosymbiotic bacteria).- Organism
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A multicellular organism is an organism that consists of more than one cell, in contrast to a unicellular organism.
All species of animals, land plants and most fungi are multicellular, as are many algae, whereas a few organisms are partially uni- and partially multicellular, like slime molds and social amoebae such as the genus Dictyostelium.
Eukaryotes are organisms whose cells have a nucleus enclosed within a nuclear envelope.
Eukaryotic cells typically contain other membrane-bound organelles such as mitochondria and Golgi apparatus; and chloroplasts can be found in plants and algae.
A unicellular organism, also known as a single-celled organism, is an organism that consists of a single cell, unlike a multicellular organism that consists of multiple cells.
Many eukaryotes are multicellular, but some are unicellular such as protozoa, unicellular algae, and unicellular fungi.
A protist is any eukaryotic organism (that is, an organism whose cells contain a cell nucleus) that is not an animal, plant, or fungus.
Therefore, some protists may be more closely related to animals, plants, or fungi than they are to other protists; however, like the groups algae, invertebrates, and protozoans, the biological category protist is used for convenience.