What brought the decline of the mound builders of cahokia?

a prolonged drought sometime in the mid-fifteenth century

a combination of invasions, epidemics, and over-hunting

the arrival of spanish colonists in the 1530s

a mass exodus caused by resource shortage

The decline of the Mound Builders of Cahokia brought a mass exodus caused by resource shortage.

Option 4

Explanation:

Mound Builders were a group of people lived in a place called Cahokia. They built various styles of mounds to live in, to worship and also to bury people. Cahokia flourished well and their major production was corn. Also, it reformed to a notable successful city by other cities.

During the 13th century, the medieval climate warming started to happen. According to researches Cahokia had experienced a prolonged drought in its 1350s. Also, the land became unsuitable to grow corns. The food resources also started to reduce in the area.

All the resources were more scarce after 1250. So people started o leave the place abandoned to new places they could survive. At the time of Spanish's entry to Cahokia in the 15th century, the place was completely abandoned.

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