what conclusion did the researchers from university of california san diego reach regarding the best type of material to use for beach nourishment?
o large, coarse grains of sand should be used since they remain on the beach longer.
o sand mixed with soil should be used to promote plant growth and prevent erosion.
sandy areas of a beach should alternate with cement areas to prevent
o
boulders should be placed near the water's edge to prevent the current from taking the new sand out to the ocean.

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.