For each description below, identify if the best study would be an experiment or an observational study. Geochemists want to determine the amount of certain elements in the Earth's crust. A team of biologist wants to track the hunting behavior of Antarctica's penguins in different sea-ice conditions. A psychologist wants to know if people would spend less time on social media apps if the app displays a timer showing how long they've been in the app. Engineers want to compare a design for a new alloy-based solar panel to current models to determine if the lower-cost alloy panel is as efficient at producing energy. A financial analyst wants to know what percent of her clients invest monthly in an IRA. A. Experiment B. Observational Study