Front

Look at the graph, which statement would be the most accurate: As the wolve population increased, the elk population and the puma populations decreased., The wolve, puma and elk populations all increased through time., Overall, the wolve, and puma had a positive slope, while the elk has a negative slope., The pumas could no longer catch the elk so their population declined.

Back

As the wolve population increased, the elk population and the puma populations decreased.

Front

Look at the graph, which line(s) has a positive slope? Options: wolves and puma, wolves and elk, wolves, pumas and elk

Back

wolves

Front

Look at the graph, how many wolves were there in 2002?

Back

15

Front

Look at the graph, how many wolves were there in 2015?

Back

65

Front

Look at the graph, how many elk were there in 2002 and 2015?

Back

There were 8,500 elk in 2002 and 2,500 elk in 2015.

Front

When wolves were reintroduced to Yellowstone National Park ______

Back

The elk population decreased, other plants and animals increased in number and the ecosystem became more diverse.

Front

The wolves caused _____

Back

a trophic cascade

Front

A keystone species is _____

Back

a species that holds the entire ecosystem together.

Front

Why are the populations of pumas and wolves so much smaller than the elk population in 2015?

Back

Pumas and wolves are tertiary consumers so they have less energy available to them because of the 10% rule.