Which variables describe characteristics of the study participants such as gender and years of service that cannot be manipulated

Demographics.

Explanation:

The variables which describe the characteristics of the study participants such as gender and years of service that cannot be manipulated is known as demographics.

Demographics can be defined as the study and analysis of the characteristics of a population based on pre-defined factors such as education, race, income, sex or gender, and age.

For example, businesses gather, analyze and use demographic informations about people in the target market so as to have a competitive edge or advantage and to help build a strong relationship.

i bought a new phone

explanation:

i will send you the money when i get back from lunch

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.