Primary succession
food web
secondary succession
nitrogen cycle
100
What is Primary Succession?
A type of succession that occurs on a surface where no ecosystem existed before.
100
What is a Food Web?
100
what is Secondary Succession?
Occurs on a surface where an ecosystem has previously 
100
what is the nitrogen cycle?
A repeating cycle of processes during which nitrogen moves through both living and non living things
200
what are causes of primary succession?
Volcanic eruptions, glaciers, flooding, land slides, and oil spills.
200
what is a primary consumer?
They make up the second trophic level
200
what event can cause secondary succession?
Fire, floods, or windstorms
200
What molecules do plants produce using nitrogen?
sugars from water and carbon dioxide
300
Where can Primary Succession occur?
Rocks, cliffs, or sand dunes
300
What resource do plants not compete for?
Sunlight and water
300
What appears first during secondary succession?
Insects and weedy plants
300
Why do bacteria need nitrogen?
Nitrogen is needed for the synthesis of amino acids and DNA etc.
400
what is the most important part of primary succession?
The formation of soil and the increased amount of shade.
400
About what percentage of energy is transferred from one trophic level to the next?
About 10 percent
400
Does secondary succession begin with no life?
No
400
What organism helps to continue the nitrogen cycle?
Nitrogen-fixing bacteria
500
Is primary succession faster than secondary?
No, secondary usually faster than primary
500
What is the purpose of a food web?
It shows how energy is transferred up food chains that are interlinked with other food chains
500
Why is secondary succession so much faster?
because soil and nutrients are already present
500
How human body is affected by nitrogen?
nitrogen helps in protein synthesis, amino acids that influence growth