The diagram shows a food web in a national park.

A diagram of a food web is shown. Grasses, Aspen Trees, Cottonwood, and Willow are shown at the lowest level, Beaver, rabbit, elk, and mule deer are shown at the second level from the bottom. Topmost level has the coyote and gray wolf. Arrows are drawn from grasses to beaver, grasses to rabbit, grasses to elk, grasses to mule deer, aspen trees to beaver, aspen trees to elk, aspen trees to mule deer, cottonwood to beaver, cottonwood to elk, cottonwood to mule deer, willow to elk, willow to mule deer, beaver to coyote, rabbit to coyote, elk to gray wolf, and mule deer to gray wolf.

What is most likely the effect of unrestricted hunting of gray wolves on the food web of the region?

The vegetation will decrease.
The coyote population will increase.
The beaver and rabbit population will increase.
The elk and mule deer population will decrease.

The table shows the potential energy and kinetic energy of a skier at two different positions on a hill.


Position and Energy
Position (above ground) Kinetic Energy Potential Energy
100 meters 0 units 50,000 units
60 meters 20,000 units ?


What is the potential energy of the skier at a height of 60 meters above the ground?
30,000 units, because total energy decreases
70,000 units, because total energy decreases
30,000 units, because total energy remains unchanged
70,000 units, because total energy remains unchanged