Why euglena is a connecting link between plants and animals ?
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That is an old fashioned notion. They were traditionally difficult to classify according to typological classification systems (which are misleading).
They are neither plants, animals, fungi, or bacteria. They are a separate branch(s).
They are classified as protists, which is is not a phylogenetic kingdom, but is just a mish-mash of organisms that are not plants, animals, fungi, or bacteria (nor viruses).
Protists are negatively defined, by simply not belonging to any other kingdom.
Protists are simply grouped together for convenience.
Protists remain poorly known, studied, and classified.
Most species of Euglena have photosynthesizing chloroplasts within the body of the cell, which enable them to feed by autotrophy, like plants. However, they can also take nourishment heterotrophically, like animals. Since Euglena have features of both animals and plants, early taxonomists, working within the Linnaean three-kingdom system of biological classification, found them difficult to classify. It was the question of where to put such "unclassifiable" creatures that prompted Ernst Haeckel to add a third living kingdom (a fourth kingdom in toto) to the Animale, Vegetabile (and Lapideum meaning Mineral) of Linnaeus: the Kingdom Protista.
hope I can help u
They are neither plants, animals, fungi, or bacteria. They are a separate branch(s).
They are classified as protists, which is is not a phylogenetic kingdom, but is just a mish-mash of organisms that are not plants, animals, fungi, or bacteria (nor viruses).
Protists are negatively defined, by simply not belonging to any other kingdom.
Protists are simply grouped together for convenience.
Protists remain poorly known, studied, and classified.
Most species of Euglena have photosynthesizing chloroplasts within the body of the cell, which enable them to feed by autotrophy, like plants. However, they can also take nourishment heterotrophically, like animals. Since Euglena have features of both animals and plants, early taxonomists, working within the Linnaean three-kingdom system of biological classification, found them difficult to classify. It was the question of where to put such "unclassifiable" creatures that prompted Ernst Haeckel to add a third living kingdom (a fourth kingdom in toto) to the Animale, Vegetabile (and Lapideum meaning Mineral) of Linnaeus: the Kingdom Protista.
hope I can help u
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they r both autrotropic as well as heterotropic.
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