What does a beta of 1.2 mean? If the market return increases by 15%, what impact would this change be expected to have on the assets return? If the market decreases by 8%?

Can an investment have a beta of zero? If so, what does this mean in terms of market risk? What is an example of a zero-beta asset?

Can an investment have a negative beta? What would a beta of -0.2 mean? If the market return increases by 10%, what impact would this change be expected to have on the assets return? If the market decreases by 10%? What is an example of a negative-beta asset?