Final answer:
Fungi can be harmful by causing illnesses, establishing parasitic relationships, producing toxic compounds, and destroying plant tissue.
Explanation:
Fungi can be harmful in various ways due to their ability to:
- Cause human illness: by producing toxins that can lead to poisonings
- Establish parasitic relationships: with plants and animals, causing diseases and crop damage
- Produce toxic compounds: that can harm humans and other animals
- Destroy plant tissue: directly or through potent toxins, resulting in host death and even ergotism in animals like humans
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