Which process releases carbon dioxide into the atmosphere?

Which diagram represents the amount of energy available at each feeding level in an ecosystem?

Which of the following is an example of a freshwater ecosystem?

Which of the following is an example of a saltwater ecosystem?

Which of these is a renewable resource?

Which of these is a nonrenewable resource?

Which of these is NOT an alternative to fossil fuels?

Which of the following is necessary for the production of geothermal power?

Photovoltaic cells work only ___.

Composting is the recycling of ___.

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