Choose the statement that creates a strong cause-and-effect connection.

a. many students in our school have contracted the flu.
b. a rainy climate and poor drainage lead to frequent floods.
c. eating a nutritious lunch is important for many reasons.
d. poor grades in school can be a problem later in life.

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.