What are expenditures for assets subsequent to acquisition?

Many kangaroo rats live in the sonoran desert of the southwestern united states. they have a variety of adaptations for living in the desert. under which circumstance would the kangaroo rats of the sonoran desert be most likely to develop new adaptations by natural selection?

The influenza virus cause the flu, but not other diseases. why?

How do you date a sample of rock that you suspect as being one of the earliest on earth