Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Grade 4 B-1 Sci. Def

Chapter 1 Ecosystems

system A group of parts that work together as a unit
stability The condition that exists when the changes in a system over time cancel each other out
ecosystem Groups of living things and the environment they live in
population A group of the same species living in the same place at the same time
community All the populations that live in the same area
habitat An environment that meets the needs of an organism
niche The role or part played by an organism in its habitat
producer A living thing, such as a plant, that makes its own food
consumer A living thing that eats other living things for energy
decomposer A living thing that feeds on the wastes of plants and animals or on their remains after they die
energy pyramid A diagram that shows how much food energy is passed from one organism to another along a food chain
food web A diagram that shows how food chains connect and overlap
climate The average temperature and rainfall of an area over many years
diversity Variety
salinity The amount of salt in water
intertidal zone A narrow strip, along the shore, that is covered with water during high tide and exposed during low tide
near-shore zone Ocean zone that starts at the low-tide mark and goes out into the ocean
open-ocean zones The deep parts of the oceans, located far from shore
Created by: scscolts