QUESTION 3 What is the type of variable in an experiment called the treatment variable? Independent variable Dependent variable Random variable Response variable QUESTION 4 If you wanted to study the effects of soil moisture and light intensity on the growth of soybeans and required a high ability to regulate these independent variables, what type of experiment would you choose? Laboratory experiment Field experiment Natural experiment Reference experiment QUESTION 5 Cycles of nutrients and flows of energy are key factors that link the biotic and abiotic components of this ecological system into a dynamic, functioning unit. Population Community Ecosystem Dependent variable