8.What is an ecosystem?
A.a community of non-interacting organisms and their physical environment. B.a biological community of interacting organisms and their physical environment.
C.a community of non-interacting organisms and their chemical environment.

9.An organisms that creates its own food is called a______.
A.producer
B.consumer
C.decomposer

10.A______breaks down waste or dead organisms and recycles nutrients.
A.decomposer
B.consumer
C.producer

11.__________is a symbiotic relationship beneficial for one organisms,but do not affect the other in a position or a negative way.
A.predation
B.mutualism
C.commensalism ​