Which of the following best describes the process of nitrogen fixation in ecosystems?

What is the main role of decomposers in an ecosystem?

Which of the following processes is primarily responsible for the movement of water within the Earth's spheres?

In an ecosystem, what is the primary source of energy that fuels most food chains?

Which term describes the variety of life in a particular ecosystem?

What process enables plants to convert carbon dioxide and water into glucose and oxygen using sunlight?

Which of the following statements best describes the role of producers in an ecosystem?

What happens to energy as it moves through an ecosystem from producers to higher trophic levels?

Which process is responsible for the release of carbon dioxide into the atmosphere from living organisms?

What is the primary component of the Earth's atmosphere that is essential for life and is also a key player in the greenhouse effect?

Which process is primarily responsible for the transfer of energy from the sun to producers in an ecosystem?

Which of the following best describes how carbon cycles through the Earth's spheres?

What role do decomposers play in the cycling of matter within ecosystems?

Which process is primarily responsible for the movement of water through the Earth's spheres in the water cycle?

In which form do plants primarily absorb nitrogen for use in biological processes?

What is the primary source of energy for most ecosystems on Earth?

Which of the following best describes the role of the phosphorus cycle in ecosystems?

What is the process called when water vapor cools and changes back into liquid water in the atmosphere?

Which of the following processes contributes to the transfer of energy through food webs in ecosystems?

Which of the following statements best describes the relationship between photosynthesis and cellular respiration in an ecosystem?

Which of the following processes does NOT contribute to the cycling of matter in Earth's spheres?

In the food web, which of the following roles does a primary producer NOT serve?

Which of the following best describes the Law of Conservation of Mass as it relates to ecosystems?

What process in the nitrogen cycle converts atmospheric nitrogen into a form usable by living organisms?

Which of the following elements is a crucial component of all organic molecules found in ecosystems?

In an ecosystem, which of the following is primarily responsible for the decomposition of organic material?

Which process in the water cycle is primarily responsible for the movement of water vapor from the Earth's surface into the atmosphere?

Which of the following best explains the role of keystone species in an ecosystem?

What is the main source of energy that drives the cycling of matter in Earth's ecosystems?

Which of the following processes helps to recycle carbon back into the atmosphere?

Which of the following processes is primarily responsible for the cycling of carbon through the Earth's spheres?

What role do decomposers play in an ecosystem?

Which of the following is NOT a step in the water cycle?

How does energy flow in an ecosystem?

Which gas is primarily absorbed by plants during photosynthesis?

What is the main source of energy for the Earth's climate system?

Which of the following processes contributes to the nitrogen cycle by converting atmospheric nitrogen into a usable form for plants?

What process involves the transfer of energy through food chains, starting with plants?

Which of the following is a major method through which nutrients are cycled in an ecosystem?

What is the primary role of producers in an ecosystem?