Match the components of MSW landfill to its description. cells groundwater monitoring stations bottom liner leachate collection system A system of pipes that collect contaminated water that seeps into the bottom of a landfill. arrowRight They are approved areas for waste disposal. arrowRight The landfill part that prevents the contact of buried waste with underlying soils and groundwater. arrowRight They are built to test the presence of leachate chemicals in the groundwater around the landfill. arrowRight

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.