The Carbon Cycle

What is burned in a factory to release carbon dioxide into the atmosphere?
Soil
Carbon
Trees
Fossil Fuels
What is the atomic number of carbon (this is mentioned!)?
4
5
6
7
Which of these is a product of respiration?
Oxygen
Glucose
Carbon dioxide
Water
What do plants need carbon dioxide for?
Respiration
Breathing
Perspiration
Photosynthesis
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