Which ones can be separated or made into a simpler substance?
a. mixture
b. element
c. compound
* answer each one*

wher is the rest of the question

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.  

how important do you think an instrument is to the musician who plays it?