Answer:
C. Varieties of an element that differ only in the number of neutrons are called isotopes.
Explanation:
The Earth is approximately 
old. The solar system formed from giant gas clouds which was a part of the solar nebula.
The surface of soil which demarcates two soils of different geological ages is called a unconformity.
Palesol is the soil that lies between sediments or volcanic deposits. If the paleosol is older they have lithified rock.
Hence, option C is true.
You can grow very tired if you are not used to it at first. Later on in life your body should adapt to this change. I’ve read that even though we are told to sleep for 8-9 hours a day, those hours are meant to be separated through out the day. On the other hand, everyone’s body is different so it can vary between person. Hopefully this helps.
Explanation:
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Answer: D. An economic system characterized by voluntary allocation
Explanation: Socialism promotes or encourages the need for production, distribution and exchange to be run by community at large instead of only the government running the affairs of the community.
Socialism is a shared responsibility for the production and distribution of resouces between individuals in the community or a group. It is the economic and political theory that encourages individuals to do things collectively for the common goal of the society.
