Abiologist observes that a species of beetle is abundant under logs in the forest but is rarely observed in any other location. (a) identify three variables (two abiotic and one biotic) that might explain why these beetles are found under logs much more frequently than anywhere else. (b) using one of the factors listed in part (a) as an independent variable, write a hypothesis that proposes how this variable could cause the beetles to be found more frequently under logs. (c) design a procedure for a controlled experiment to test your hypothesis. (d) describe the results that would support your proposed hypothesis, and the results that would refute your hypothesis.