Due in 4 hours/about 100 words each question...Thanks in advance

Some mutual funds are "loaded" and some are not loaded. What is a loaded mutual fund? How do you know what your cost is in buying a mutual fund?

In your own words, what is the difference between preferred stock and common stock?

In your own words, what is an exchange traded fund (ETF), mutual fund, and a closed-end fund? In what ways are they alike and in what ways are they different?