Larvae of a certain insect are found in pond a but not in pond b. design a controlled experiment that would explain the observed distribution of these insect larvae. be sure to include the following in your design. formulate a hypothesis. identify the variable that will be manipulated. outline the field and/or laboratory procedures that will be followed. describe what data you will collect. discuss the possible results and relate them to the distribution of the insect. what are indicator species and how are they used to assess environmental quality? give a specific example of such a species and its use.