The food chain is the cycle that animals interact in how they eat each other. This is also similar to Trophic levels, and how the energy flows and matter cycles between animals and different levels of the food chain.
An ecosystem.
A community of plants and animals interacting with each other and abiotic factors in an environment is called an ecosystem.
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2 or more chemical substances interacting with each other to form a new substance
biology
Ecosystem
Various populations on species interacting with each other.
simply Increase the facilitation for man with interacting with each other
Symbiotic
Gears are just multiple levers interacting with each other.
quadricycle?
Tricycle?