PLS HELP ITS SUPER HARD

In which research method does a researcher change the value of one variable to determine how the change affects another variable? a. experiment b. observational research c. survey d. case study

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.

Attempted crimes are as equally against the law. do you think punishing someone for what they tried to do is as important as punishing someone for what they did do? explain your reasoning and use evidence to back it up.