Which of the following sets is a singleton set?
A={ x/x^ 2 =49.x in I\}
B={y/5+y^ 2 =4+2y^ 2 ,}
C={P/P e I,P3=; 27}
D ={q/q2_25=0,q e}
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Step-by-step explanation:
An autotroph or primary producer is an organism that produces complex organic compounds using carbon from simple substances such as carbon dioxide, generally using energy from light or inorganic chemical reactions.
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