Fill in the Blanks Ecosystems. Final activityOnline version Ecosystems by Mariam Domingo 1 population producers environment secondary species consumers interrelationships parasitism mutualism Decomposers physical community Scavengers terrestrial Ecosystems consist of a , living things and the among them and the environment . Physical environment can be or aquatic . All living things are grouped into . All the organisms of one species in an ecosystem make up a , and all the populations of an ecosystem make up a . Organisms that produce their own food are called . Organisms that feed on other living things are called . These can be primary , or tertiary . feed on dead animals . break down dead plant and animal materials . Interactions among living things in an ecosystem also include other types of relationships , which can be beneficial . like and commensalism or harmful , like and competition .
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