Which fact is correct about most food chain? Consumers will always depend on producers for food.

Ecological problems are reduced by establishing a clear food chain order.

Consumer and producers belong to completely unrelated food chains.

Producers always depend on consumers for food.

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.