Which statements best describe fossils? Check all that apply.
They only show evidence of living species.
They are the preserved remains or evidence of organisms.
They can show how organisms have changed over time.
1 They do not show relationships between organisms.
They can help scientists identify extinct species.

the answer would be a

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

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.