Answer:
High face validity
Explanation:
Face validity refers to the degree to which an assessment or test subjectively appears to measure the variable or construct that it is supposed to measure. In other words, face validity is when an assessment or test appears to do what it claims to do.Tests wherein the purpose is clear, even to naïve respondents, are said to have high face validity.
The systematic study of human population is called, demography.
A galaxy I think but that seems to simple ?
