what are three main advantages of studying objects at different wavelengths of radiation?
part 2 is the green house effect operating in earth's atmosphere or harmful? give examples. what are the consequences of an enhanced greenhouse effect?

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

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.