A box is sitting at rest on the floor. A boy pushes on this box with a force of 10 Newtons. The frictional forces between the box and the floor that oppose the boy's push is 2 Newtons

a:

by the combination of an unlimited number of elements

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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.