Question

Select each correct answer. More than one answer may be correct.
Examine the diagram below.



Which of the following is a source of carbon dioxide in the atmosphere?
animals
factories
sunlight
plants

Answer 1

Correct answers: animals and factories.

- Animals produce CO2 by respiration.
- Factories emit CO2 by burning fossil fuels.
- Sunlight is not a source of CO2.
- Plants mostly remove CO2 via photosynthesis (though they also respire, their main role in this context is as a sink).