Please help:( Look back at your answer to part A. So far, you haven't added anything to the flask or removed
anything from it. Also, the contents of the flask have returned to the same temperature that they
were in part A. Considering the appearance of the solution in the flask, is the solution
unsaturated, saturated, or supersaturated? Explain your reasoning.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.