What are unintentional deaths?

What greek scientist created a screw to move water for irrigation?

People of french origin make up about of the canadian population. 23 percent 50 percent 1 percent 76 percent

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.