Why are not plants?

Fungi come in a wide variety of forms and life cycles. As a consequence it is very hard to classify them.
In the past, fungi were classed as plants and only after in-depth studies the features that distinguished them from both vegetal organisms and all the other eukaryote organisms were discovered, so that they could be considered as belonging to a completely different kingdom.
One of the first essential differences from plants is that fungi are heterotrophic; secondly, their cellular walls are composed of chitin, a carbohydrate that lacks in plants but can be found in the external skeleton of insects and crustaceans. In addition, fungi can store glycogen as a reserve material just like animals do.

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