The systematic study of population, including its structure, dynamics, and trends, is known as Demography. It focuses on statistics related to population size, density, distribution, and changes over time. Other fields like oceanography focus on marine environments and polygraphy deals with lie detection, not populations.
उत्तर प्रदेश में सर्वाधिक लिंगानुपात वाला जिला है-
Fill in the blank with the correct option.
The teacher believed that the student’s sudden lack of interest in class was an ..........., as he had always been enthusiastic and attentive.
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)