Answer:
less
Explanation:
females are proven to be shorter than men so it is less
The American Imperialism during the late 19th century
Answer: Longitudinal study
Explanation:
Longitudinal study is known to be a type of research study in which research is conducted about a sample of individuals at regular interval in order to determine the effect pertaining to development and changes which occur or happen overtime. This form of research permits researchers to study the same sample of people repeatedly throughout the time of the research and make comparison. Thus, it cost a lot of money and time.