Answer:
Cross-sectional research.
Explanation:
Here's a definition: Cross sectional research is a study in which subjects of different ages are compared at the same time.
Answer:
In 1847 "Kangchenjunga" was discovered as highest mountain before discovery of mount everest. Kanchanjunga ( 8,586 m) was considered to be the highest mountain from 1838 until 1852. Mount Everest was declared the highest peak of the world in 1852 and confirmed in 1856.
Explanation:
