When Tasha positioned a steel ball at the top of the ramp, it had gravitational potential energy. The pull of gravity on the ball changed the object's potential energy to kinetic energy. Give another
example of something that has gravitational potential energy.

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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.