Which characteristics can be used to differentiate star systems? Select three options. 1( the number of stars in the system
2( the level of dust and gas
3( the age of the stars in the system
4( the way stars are organized in the system
5( the color of stars in the system

Don't mind the subject btw.

 The age of the stars in the system.

Explanation: All stars have different ages; Stars take on certain forms depending on their age, causing a difference in their looks. Thus making #3 as your answer. ( The age of the stars in the system)

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.

propioception;