The cladistic approach to primate classification is Group of answer choices based on levels of anatomical complexity, without consideration of ancestor-descendent relationships. based on direct observation of phenotypes only. based on the use of anatomical and genetic evidence to establish ancestral relationships. also called the gradistic method of classification.

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.