Part of the human body system is pictured. - Kidney
Ureter
Bladder
The main function of this system is to -
O control reproduction
transport oxygen
O produce hormones
remove waste

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.  

d : a person who learns about the world by observing it. no that is not a smiley face

explanation: