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