A biological interaction where one organism harms another without any benefit to itself. It’s a type of competition between species.
Examples of amensalism are: When large animals like cattle or sheep trample grass, the grass is harmed but the animals are not. The bread mold Penicillium produces penicillin, which kills certain bacteria. Black walnut trees release a chemical called juglone from their roots that kills other plants. Algae spread across the surface of water, capturing sunlight and nutrients.
