How has the human population influenced this food chain? a) it has increased the prairie dog population by killing off the predators. b) it has reduced the prairie dog population because they are pests to humans. c) it has reduced all three levels by reducing the amount of prairie land available. d) it has increased the amount of prairie land and also the amount of prairie dogs.

The complete question is attached below:

Option C

Explanation:

The land that is available for the growth of the producers is reduced. If the first level of the food chain is affected then the other levels of the food chain will also be affected.

Then primary consumers will be less due to less producers. The secondary consumers will also be reduced.

The different levels above these levels will also be affected due to the less availability of food from the lower tropic level.

So, the all the levels will be affected if the prairie land will be reduced.

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.