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.
Explanation:
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Answer:
Andorra.
Explanation:
The French president is considered one of the princes of Andorra. This started way earlier in the 21st century during the medieval era; and continued till today by the the land locked Andorra between Spain and France. The other prince here is the bishop of Urgell.
<span>Marco Polo was known for his extensive travel through-out _China_______ as described in his books about his travels.
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