Because of the makers of the map and derivation in which they printed it
This researcher used a "cross-sectional survey design"
<u>Explanation:</u>
A cross-sectional survey gathers data at one point in time to make conclusions about a population of interest (i.e. universe). Cross-sectional surveys have also been represented as snapshots of the demographics they gather data. Panel surveys are typically performed to assess changes in the studied population.
In this a process of sampling where scores are collected at a single point in time. For instance, cross-sectional sampling might include collecting data from individuals of different ages or levels of development to examine behavioral or other variations between them.
They trade because all countries may not have enough supplies/ resources, so they trade in order to obtain them
Answer:
A.Bern is the capital city of Switzerland
Answer:
non polluting energy source and useful in remote areas.
Explanation:
Wing mills are usually made in remote areas and it's non-polluting energy.