Answer:reciprocity
Explanation: Reciprocity is a norm amongst people which is due to the act of kindness committed by one person to us ,that result to us feeling encouraged and motivated to commit the act of kindness back to those people , it is a norm of sharing out of the kindness of our heart because people have also been kind to us.
A. Byzantine Empire, this is the answer
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.