Create an account
the way in which the organisms in an ecosystem interact with one another according to what they eat, eating the organisms below it
A treeless biome between the icecap and the tree line of Arctic regions, having permanently frozen subsoil.
A barren biome with less than 10 inches of precipitation each year with little rainfall, extreme temperatures, and sparse vegetation.
shows the amount of energy that is available to pass from one level of the food chain to the next
a population of organisms that is likely to become extinct if steps are not take to save it
The demand by two or more organisms for limited environmental resources, such as nutrients, living space, or light
describes a population of organisms that are likely to become endangered if they are not protected
a situation in which the number of organisms decreases due to natural and unnatural causes
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together