He developed a vaccine against polio

This is a company that offers the same products or services in many locations.

McDonald's is one of the earliest examples of this type of business

This is a marketing strategy in which manufacturers purposely design products to wear out or become outdated in a short period of time.

This is a major corporation that includes a number of smaller companies in unrelated industries

The height of this unprecedented population explosion was in 1957

This type of business seeks financial security through diversification, or investment in various areas of the company