Which describes the purpose of minimum-balance fees? O make sure customers keep sufficient funds in their account
collect funds for withdrawals from a competitor's machine
pay for the costs of having bank employees
penalize customers for writing checks for money they don't have

make sure customers keep sufficient funds in their account

Explanation:

Minimum balance is the amount that an account holder has to be kept in the account. The minimum amount is to be maintained so as to enjoy the benefits of the account like receiving interests. The minimum balance defers from one bank to another. Maintaining the minimum helps in accessing loans and other facilities.

the page presents four different kinds of threats that volcanoes pose and what to do before, during, and after an eruption.

answer: a. the kind of population living in your neighbourhood.

the census explorer data tool by the us census bureau allows the user to zoom in on any neighbourhood within the united states and find the kind of people residing in that by race and age.  

the tool needs to needs to be used twice – once in order to find what type of people reside in a neighbourhood, and then to see the age groups of the people in the same neighbourhood.