1. In general, metals become more brittle as temperature decreases. Why does this occur? (explainin 1-3 sentences)2. In general, metals become more brittle as strain rate increases. Why does this occur? (explain in1-3 sentences)3. Briefly describe (1-3 sentences) why a ductile-to-brittle transition temperature is seen in BCCmetals, like 1018 steel, and not FCC metals