Answer:
C) when nuclear fusion begins in the core
Explanation:
- <u>The protostar is a main-sequence star that has a core temperature that exceeds abut 10 million K and is needed for the hydrogen to operate efficiently and the </u><u>length </u><u>of this process depends on nature and the stellar </u><u>mass</u><u>, as the huge massive star have a greater and bigger core and fusion takes fast.
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- A protostar is also called as primitive star and represents the earliest phases of the process of the stellar evolution and takes place after it leaves form the main sequence star.
Answer:
B
Explanation:
In east Africa we do alot of farming a nd keeping livestock cause it gives alot of goods that people here can buy
The name given the movement in which machines changed peoples way of life as well as their methods of manufacturing
More likely the answer A if it not im sorry