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.
The point at which an economy is most efficiently producing its goods and services and, therefore, allocating its resources in the best way possible is known as production possibility frontier
raise spending to stimulate the economy
Answer:
C) the representativeness heuristic.
Explanation:
Representativeness heuristic: In psychology, the term representativeness heuristic is referred to as the phenomenon which involves categorizing or organizing different objects based on the object's similarity assessment and within the category prototype, for example, cause and effects complement each other. The representativeness heuristic involves an easy computation and therefore referred to as a mental shortcut.
In the question above, the given statement represents the powerful influence of the representativeness heuristic.
