Why did vassals have to serve lords?

Because the lords gave them their land in return if someone attack the land the vassals would protect it they got land for protecting and then if they got a big enough land they could sell some and become lords and then they would have vassals so you could get land and then sell some of it and you would get vassals

Explanation: I have taken the test before and I know because I like this kind of stuff. :)

answer: a

explanation:  

stocks and bonds are the two main classes of assets investors use in their portfolios. stocks offer an ownership stake in a company, while bonds are akin to loans made to a company (a corporate bond) or other organization (like the u.s. treasury). in general, stocks are considered riskier and more volatile than bonds.

savings accounts are just money in a bank- they are insured by the fdic for up to 250,000.   very little risk

the average mutual fund holds hundreds of different securities, which means mutual fund shareholders gain important diversification at a low price. which means if one stock or bond drops it will have very little affect on the mutual fund - again very little risk

c or d. good luck !