This is the evaporation of water from the leaves of plants.
What is transpiration
100
All organisms require nitrogen to make amino acids which are used to build this.
What is proteins?
100
Producers obtain carbon dioxide from _________ during photosynthesis.
What is the atmoshpere?
100
These are closed loops through which elements pass from one organism to another and among parts of the biosphere.
What are biogeochemical cycles?
200
Water enters the atmosphere as this.
What is water vapor?
200
Nitrogen gas makes up this percentage of Earth's atmosphere.
What is 78 percent?
200
Human activities, such as burning fossil fuels releases carbon dioxide into the atmosphere. This has increased the level of carbon in the atmosphere by this percentage in the last 100 years.
What is 25 percent?
200
These are the chemical substances that an organism needs to sustain life.
What are nutrients?
300
The process by which water changes from liquid form to an atmospheric gas.
What is evaporation?
300
Only certain types of ______ can use nitrogen gas directly.
What is bacteria?
300
Consumers obtain carbon in the form of _____________ by eating producers.
What is carbohydrates?
300
This is the process in which bacteria convert nitrogen gas into ammonia.
What is nitrogen fixation?
400
Water vapor becomes tiny droplets that form clouds.
What is condensation?
400
The conversion of nitrogen gas into ammonia is this process.
What is nitrogen fixation?
400
Carbon is found in this form in the ocean.
What is calcium carbonate?
400
This is the process in which soil bacteria obtain energy by converting nitrates into nitrogen gas, which is released into the atmosphere.
What is denitrification?
500
When water droplets that form clouds are large enough, the water returns to Earth's surface in this form.
What is precipitation?
500
Soil bacteria convert nitrates into nitrogen gas in this process.
What is denitrification?
500
Geochemical processes, such as ____________ and volcanic activity release carbon dioxide to the atmosphere and oceans.
What is erosion?
500
This is the nutrient whose supply limits productivity.