A donkey and a beetle both use legs for locomotion, but the donkey has an 1 point internal bony skeleton while the beetle has an exoskeleton made of chitin.
Which of the statements accurately describe the relationship between the
donkey and beetle? *
These organisms have homologous structures and therefore have a recent common
ancestor
The DNA sequences for these two organisms will show 99% homology since they
both code for legs
The organisms share a recent common ancestor because the legs of these organisms
are vestigial structures.
The donkey and the beetle do not share a recent common ancestor because the legs
of these organisms have a common purpose but not a common structure.

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.