Need help pls respond

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.

Can i have all the nicknames of all 50 states of usa?

What word means having a variety of cultures in the same area? a. cultural diversity b. culture region c. popular culture d. population density