What can an ecosystem survive without? 

A)  producers 
B)  decomposers 
C)  consumers 
D)  autotrophs

Autotrophs (producers) are the foundation of all ecosystems as they are the primary source of energy for all other organisms. Without autotrophs, there would be no energy flow through the ecosystem and all other organisms, including consumers and decomposers, would eventually die off. While consumers and decomposers play important roles in the ecosystem, they are not as essential as autotrophs.