At which point in the life cycle of a star does nuclear fusion begin?

A. Black hole

B. Main sequence

C. Nebula

D. Protostar

Question

At which point in the life cycle of a star does nuclear fusion begin? 

A. Black hole

B. Main sequence

C. Nebula

D. Protostar

anonymous · Answer

I also need help with 
Which of the following classifications of star temperature is most like Earth's sun? 

A. O
B. M
C. G
D. B

anonymous · Answer

Both of these questions don't require a direct answer, I just need help with them.

thomaster · Answer

Both of these questions don't belong in the biology group.
I'd use physics.

anonymous · Answer

Physics is something completely different, it is about movement this is about a star's temperature rating and when its nuclear reactions start, I do not believe that has anything to do with movement.

shrutipande9 · Answer

@PrincessNorn he is right...here on OS we try to segregate the subjects so it becomes easier for the people to ask ques and ans them.... http://cde.nwc.edu/SCI2108/course_documents/stars/star_lifecycles/star_lifecycles.htm i think this might help u

anonymous · Answer

Thank you but the end question is still sitting there, and that's the harder of thee 2, and I will move it to physics...

shrutipande9 · Answer

http://openstudy.com/study#/updates/4fe23c7ce4b06e92b8713146 this might help u...i tried to find something..but i m nt good at this..hope it helps..

anonymous · Answer

Thanks that helped.
:)

shrutipande9 · Answer

ur welcome:)