Why is the CO2 and O2 cycle considered to be a cycle?
there is a continuous exchange of gases
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15
Animals use oxygen for _____________.
breathing
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15
Animals and plants use substances that cycle through the environment. Which substance is needed by plants to survive and is released into the environment by animals?
carbon dioxide
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15
Burning Fossil Fuels can produce ...
carbon dioxide
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15
Plants use _____________ to make their own food during photosynthesis.
sunlight, carbon dioxide and water.
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15
Plants and animals are interdependent of each other. is this statement true or false?
true
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15
If all the trees on Earth were destroyed, what would be the effect on humans?
there would be a lack of oxygen
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15
A gas that is produced by plants during photosynthesis that animals use for respiration.
oxygen
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15
oxygen is a gas produced by plants and used by .......
animals and people
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15
The process in which plants use energy from the sun to make their own food is called .....
photosynthesis
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15
Which type of organism gets its energy directly from the Sun?
producer (plants)
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15
What is carbon dioxide used for?
plants use it to make their food
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15
________________ could increase the amount of oxygen in the air.