In Yellowstone, the reintroduction of gray wolves to the park in 1995 set off a trophic cascade, affecting many different species, ultimately changing abiotic factors in the park. All of the options below describe changes caused by the return of the gray wolf
population except:
Populations of elk were driven down by predation
Trees and brush populations rebounded from predation pressure from herbivores,
Nesting bird populations increased due to increased habitat availability
Beaver populations changing, adding to the shift in water flow through the park.
All of the above were true effects of the reintroduction of wolves.

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection

How can you tell the difference between rough er from smooth er?

Which pair of sentences is describing the same velocity? a. a car is parked. a car is moving in circles. b. a bus drives 40 miles per hour north. a truck drives 50 miles per hour north. c. a boy walks east at 6 kilometers per hour. a girl walks west at the same speed as the boy. d. valerie rides her bike south at 8 kilometers per hour. owen jogs south at 8 kilometers per hour.