Question

elk counts.
yellowstone national park wolf population
select all the statements that are supported by the graph and the information provided.
from 1998 through 2002, when there were at least 90 elk per wolf, the wolf population grew.
in 2008, the year with the fewest elk per wolf, the wolf population declined.
in 2013, the year that started with the fewest documented elk, the wolf population declined.

Explanation:

1. For the first statement: From 1998 - 2002, the wolf population (blue line) shows an upward trend, and the elk - wolf ratio condition (at least 90 elk per wolf) is given, so the graph supports the wolf population growth.
2. For the second statement: In 2008, to find elk per wolf, we consider the number of elk and wolves. The wolf population (blue line) in 2008 is at a peak and then starts to decline, and it's stated as the year with the fewest elk per wolf, so the graph supports the wolf population decline.
3. For the third statement: In 2013, the elk population (red line) is at a low, and the wolf population (blue line) shows a decline, so the graph supports that when elk are few, the wolf population declined.

Answer:

• From 1998 through 2002, when there were at least 90 elk per wolf, the wolf population grew.
• In 2008, the year with the fewest elk per wolf, the wolf population declined.
• In 2013, the year that started with the fewest documented elk, the wolf population declined.