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Why is the Carbon dioxide concentration higher at night?

What human activities cause an increase in carbon dioxide?

Methane, water vapour and Carbon dioxide are all?

What do Saprophytes use to break down large insoluble molecules into smaller soluble molecules?

When decay is prevented what forms?

The Earth's atmosphere is heating up due to?

Name consequences of global warming

Name a possible benefit of global warming

What are the 4 steps of the nitrogen cycle?

In nitrification what compounds are converted and to what?