At a ball game we can observe people eating hot dogs, chips, and burgers. if all are priced the same and we observe michelle eating a hot dog and david eating a hamburger, we can conlcude that

If the price of hot dogs, chips, and hamburgers are the same. We can conclude that Michelle and David are eating a hot dog and hamburger we say that they've spent the same amount of money for two different products.

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.