Cycles
A diagram that shows the amount of energy that moves from one feeding level to another in a food web
Energy pyramid
The changes that occur after a disturbance in the ecosystem
Secondary succession
An organism that can make its own food
Producer
The first species that populate and area
Pioneer species
The pattern of overlapping food chains in an ecosystem
Food web
The number of different species in an area
Biodiversity
A consumer that only eats plants
Herbivore
Process by which individuals that are better adapted to the environment are more likely to survive and reproduce than others
Natural selection
The changes that occur in an area where no ecosystem had existed
Primary succession
A consumer that only eats animals
Carnivore
The process of changing free nitrogen gas into a usable form
Nitrogen fixation
A series of processes by which something gets eaten by something else until the largest predator dies and the cycle repeats
Food chain
The process of restoring land to a more natural state
Land reclamation
An organism that obtains energy by feeding on other organisms
Consumer
An organism that breaks down waste and other things
Decomposer
The struggle between organisms for limited resources in a habitat
Competition
A close relationship between species that benefits at least one of the species
Symbiosis
A consumer that eats both plants and animals
Omnivore
An organism that does the killing in predation
Predator