Producers - Living things that make their own food., Primary consumers - Herbivores that obtain their food from other living things. , Secondary conumers - Carnivores that obtain their food from other living things., Food chains - Show how living things feed on other living things in an ecoystem. , Food webs - Consist of many food chains. , Mutualism - Is the relatinship between two species when both benefit. , Competition - Is the relationship between different species that have the same needs. , Commensalism - Is the relationship between two species when one eats the food left by the other.  , Parasitism - Is the relationship between two species when one benefits while the other suffers. ,

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