An intentional use of understandment the rangers and ironic effect is called what

In the construction of a new housing development which factor of production can be categorized as land?

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.

An refers to a specific factor that has a range of possible values