Polyethylene is used in many items, including water pipes, bottles, electrical insulation, toys, and mailing envelopes. It is a polym. er, a molecule with a very high molar mass made by joining many ethylene molecules {the basic unit is called a m. onom. er) together. The initiation step is

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explanation:

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) : )

the answer is b. dilution

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.