how does critical mass play a role in nuclear reactions?\no it is the minimum amount of material needed to…

how does critical mass play a role in nuclear reactions?\no it is the minimum amount of material needed to start a fission reaction.\no it is the minimum amount of material needed to start a fusion reaction.\no it is the minimum amount of material needed to sustain a fission reaction.\no it is the minimum amount of material needed to sustain a fusion reaction.
Answer
Brief Explanations:
Critical mass is related to nuclear fission. It's the minimum mass of fissile material required to sustain a chain - reaction. Fusion reactions don't rely on critical mass in the same way.
Answer:
It is the minimum amount of material needed to sustain a fission reaction.