What is the difference between primary and secondary data?

What is the best explanation as to the dividing line between french and british claims in north america at this time?

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.

Describe the relationship between population growth consumption and the environment.