Explain what the biosphere is

Explanation:

Natural vegetation and wildlife exist only  in the narrow zone of contact between the  lithosphere, hydrosphere and atmosphere that  we call biosphere. In the biosphere living beings  are inter-related and interdependent on each  other for survival. This life supporting system  is known as the ecosystem.

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"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

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.