Create an account
family trees showing the occurrence of traits in parents and offspring across multiple generations
a large structure inside a cell that contains the genetic material (DNA and RNA) and controls the cells activities
the hypothetical supercontinent that existed when all Earth's landmasses were joined before the Triassic period
the movement of molecules across the cell membrane without the expenditure of energy
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