What could both add and remove carbon from the atmosphere in the model above?

In a grassland ecosystem, nitrogen and other matter accumulate in animal waste. Which organisms return this matter to the ecosystem by decomposing the waste?

For several years, a population of bats living in a cave has been decreasing in size. Which of the following factors could cause this decrease in the size of the bat population? Choose the 2 factors that apply.

According to the Law of Conservation of Mass, there is a fixed amount of nitrogen on Earth. The nitrogen that exists in the air is fixed by _________________ in the root nodules. This allows it to exist in the soil. _______________ then use the nitrogen to make proteins and other complex compounds. When animals eat the plants, the nitrogen is transferred to their bodies. When these organisms die, the nitrogen is broken down by fungi and returned to the air by bacteria.

A desert ecosystem includes grasses, rabbits, snakes, and hawks. As you move up the energy pyramid of this ecosystem, each level has _______________ energy than the level below.

Slippery bananas live on the forest floor of the humid forests of the Pacific Northwest. They consume and decompose a variety of materials, including small dead animals and decaying leaves. What term describes slippery bananas?

For the organism and the energy transfer described, what energetic role is the organism playing within its ecosystem?

Fungi in a forest decompose dead trees.

The diagram shows the food web of a forest ecosystem. Which organism has access to the least amount of energy?

Choose the level of the food pyramid that represents the energy role of producers.

Which of the following activities would increase the amount of carbon dioxide in the atmosphere? Choose the 3 that apply.

Which part of the water cycle involves water changing from liquid to gaseous state?

A farmer spread a nitrogen-based fertilizer on a patch of grass where cows had recently grazed in the field. Why was it necessary to add a nitrogen-based fertilizer to the soil where there was a patch of grass?

In what ways are plants involved in the cycles of oxygen and carbon?

According to the food web, identify the 2 terms that describe the snake.

Analyze the food web to identify the 2 terms that describe the bird.

The marmots that inhabit a prairie environment drink water and depend on plants, including clover, for food. Which of the following terms describe both the water and the clover that marmots consume? Choose the 2 that apply.

A forest ecosystem has different levels of organization. Select the answer that shows the levels of organization of the ecosystem in order from the smallest to the largest level.

Carbon enters the forest from the atmosphere through the sugar-making process called ____________________.

Limiting factors cause population sizes to ______________.