Fundamental differences in the cell, the basic unit of life, allow for the broadest classification of all living organisms into three domains: Bacteria,
Archaea, and Eukarya. Which of the following can organisms NOT be classified on?
1. Ability to obtain nutrients
2. Mode of reproduction
3. Physical characteristics
4. Lacking a nucleus

If football was tossed in air without gravity or friction the ball would go into space

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.