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:
C. Improved technology in agriculture means it takes fewer farmers to produce the food the country needs.
Explanation:
The development of farming equipment has caused a reduction in the need for manual labor. Machines such as combine harvesters allow for vast amounts of farm work to completed in a short period. It also helps with extensive commercial farming which means there are bigger farms and fewer farmers. The Green Revolution in the mid-1900s saw the development of high yield variety crops that were stronger and more reliable. While more fertilizer and water is needed, people are not.
the person that helps out others even his/her enemy when in need is regarded as a good person.
Answer:
sudden and quicker
Explanation:
The climate on Earth has always been changing, and there are numerous factors that have had their influence on it. Some of the factors are the plate movement and the astronomical causes. Both of these factors though result in gradual changes of the climate, which can take thousands or even millions of years in order to have a significant change. The volcanic eruptions are another story. They are also one of the factors that influence the climate, but unlike the other two factors that are mentioned, the volcanic eruptions cause sharp and sudden climate changes. If the volcanic eruption is massive, or there are several volcanoes around the world erupting at the same time, they are able to change the global climate in just few days. Usually it is the enormous amounts of ashes and other particles released in the atmosphere that are blocking the sunlight and cause sudden cooling of the planet.
Answer:
Because, people can communicate with each other easily. English is the first choice of foreign language in most other countries of ... by nomads believed to have roamed the southeast European plains.
