Create an account
a group of the same kind of organisms that can mate and produce offspring that can reproduce
a climate zone located between the tropics and the polar circles generally characterizes by moderate temperatures rather than extremely hot or cold temperatures
a term used to describe a question that can be answered through an experiment or observation
an event, condition, or factor that can be changed or controlled in order to study or test a hypothesis in a scientific experiment
the continuous movement of water through the environment by evaporation, condensation, and runoff
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