A rectangular, well-mixed aeration lagoon is 60 m long, 5 m wide, and 2 m deep. It receives 400 m3/d of wastewater with a BOD5 of 336 mg/L BOD5/L for treatment. The biodegradation rate constants for the wastewater are yield coefficient = 0.8 mg VSS/mg BOD5, endogenous decay constant = 0.08 d-1, maximum specific growth rate = 1.10 d-1, and half velocity constant = 76.0 mg BOD5/L.

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.