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Sonja [21]
3 years ago
13

When does a protostar become a true star?

Geography
1 answer:
Lubov Fominskaja [6]3 years ago
5 0

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. </u>
  • 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.
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The grasslands of the midwestern United States have been grazed and
Dafna11 [192]

Answer:

B. Look around, since even a changed ecosystem is still an  ecosystem.

Explanation:

Ecosystem refers to the interaction or relationship that exist between living organisms and its surrounding environment. This environment provides habitat, food and other needs to the organisms. If the people in the Midwest determine what kind of  natural ecosystem they are in, they have to look around the environment they are living. This environment includes all the plants and animals that survive the change which occurs due to humans intervention.

8 0
3 years ago
One half of the atmosphere lies below the elevation of
Vika [28.1K]
Hey buddy,
I believe the answer should be


→ <span>By mass, </span>one half<span> of the atmospheres volume </span>lies below<span> an </span>altitude of<span> 5.6 kilometers</span>←
7 0
3 years ago
What will happen if the earth is bigger than its current size?
borishaifa [10]
There will be more space for other people, but there could be more wars or stuff alike because people will fight for places.
(I’m not sure that’s how I’ll answer it)
4 0
3 years ago
Evaluate the immediate and long term responses to earthquakes. [9 marks]
IgorLugansk [536]

Answer:

Short term- mainly involve search and rescue and helping the injured

Long term- go on for months and years after a disaster. It involves rebuilding destroyed houses, schools, hospitals, etc. It also involves kick-starting the local economy.

Explanation:

8 0
3 years ago
Divide. write 2 2/5 ÷ 6 4/5 in simplest form
77julia77 [94]
First we need to convert them into improper fractions

2 2/5= 12/5

6 4/5= 34/5

to divide fractions you flip the second one and multiply them

12      5        12
---- × ----  = -----
5       34       34

then simplify

12/34=6/17

the correct answer is 6/17

I hope I've helped!
5 0
4 years ago
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