Instead, the title of marine biologist is an umbrella term that can refer to a variety of jobs and purposes, like fish biologist, microbiologist or marine mammalogist. Marine biology is the study of marine ecosystems, which can range from studying individual microorganisms to entire environments.
1 You open a savings account at the bank. 2  The bank pays you interest on the money that you deposit and leave in that account. 3  The bank then loans that money out to other people, only they charge a slightly higher interest rate on the loan than what they pay you for your account.
Interest rates being paid to savings accounts are incredibly low right now (in fact, aside from a few specialty banks, you'll be lucky to get 1%), but in years past, 5-6 or even 10% wasn't uncommon (though you'd have to go a while back for that!). But in general, that's how interest/compounded interest works.