Advertisement Upgrade to remove ads


the smallest living part of a plant or animal

cell membrane

a thin wall that encloses the entire cell. It allows food to enter the cell and waste to leave. It helps to give the cell shape and is slightly protective.

cell wall

the tough and rigid outer wall that surrounds the cell membrane in plants. It gives stiffness to plants as they grow.


the control center of the cell. It tells the cell what to do and regulates cell growth.


organelles found only in plant cells. Chloroplasts contain chlorophyll that uses energy from sunlight to help produce (make) its own food.


a group of similar cells that work together. Examples: muscles


a group of similar tissues that does a specific job in the body. Examples: heart, lungs, stomach


a group of organs that work together to provide a function for the body. Examples: circulatory, digestive, skeletal, respiratory


an area of land where all of the water runoff flows and collects in a large body of water

Riparian Forest Buffer

an area of trees, shrubs, and other plants located next to and up slope from a lake, stream or other body of water


all water that runs off the surface of the land and washes into rivers, streams and other waterways


small plants that thrive on excess nutrients. Algae grows in waterways where excess nutrients build up.

pollution (pollutants)

anything in the environment that can harm living things or damage natural resources


an organism that makes (produces) its own food


an organism that gets energy by eating other organisms


any living thing

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 above and try again


Reload the page to try again!


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

NEW! Voice Recording