By the second law of thermodynamics:
Heat can not spontaneously flow from cold regions to hot regions without external work being performed on a system.
Heat transfer is the passage of thermal energy from a hot ( t B = 80° C ) to a colder body ( t A = 40° C ).
Answer: B ) Heat flows from object B to object A.
2mm=2,000,000 nm
2,000,000/25=80,000
The answer is 80,000 polio viruses
Valence shell it contains the valence electrons e.g. the outermost electro