Question

What is the source of carbon dioxide for photosynthesis?

Answer 1

During the natural carbon cycle, carbon is released into the atmosphere from various sources and absorbed through "sinks." For example humans and plants give off carbon dioxide throughrespiration, making them a source of carbon dioxide, while plants absorb carbon dioxide during photosynthesis, making them a sink.

Answer 2

During the natural carbon cycle, carbon is released into the atmosphere from a variety of sources and absorbed through “sinks”. For example, humans and plants release carbon dioxide when they breathe, which is a source of carbon dioxide, and plants absorb carbon dioxide during photosynthesis, which is a sink.

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