Individuals of different species that have fewer amino acid differences in their hemoglobin sequences are more closely related than individuals with
more amino acid differences. *
Comparative biochemistry
Fossil Record
Comparative embryology
Comparative anatomy

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.