Apopulation of rodents, called population a, lived together in harmony on a large landmass until one group of the population dispersed to a nearby island. two million years later, the island population is split into two smaller, equal-sized populations when a river formed across the middle of the island. now two new species have evolved on the island, a1 and a2. they have replaced the population from which they were derived. which represents the phylogeny of the three extant species discussed in this scenario?

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.

What are 3 reasons that natural selection occurs

At the age of 6 months, caleb was diagnosed with tay-sachs disease. as his primary care physician, what would you tell his parents about this disease?