Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
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. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
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

Chapter 21

TermDefinition
Biosphere the surrounding atmosphere and where there is life.
community all the populations of different species that live together in the same area at the same time.
population all the organisms of the same species that live in the same area at the same time.
competition the demand for resources such as food water and shelter.
limiting factor anything that restricts the size of a population.
population density the size of a population compared to the amount of space available.
Biotic potential the potential growth of a population if it could grow in perfect conditions with no limiting factors.
carrying capacity the largest number of individuals of one species that an environment can support
birthrate the number of offspring produced over a given time period.
death rate the number of individuals that die over the same time period.
extinct species a species that has died and has no individuals left.
endangered species a species who's population is in danger of extinction.
threatened species a species at risk but no yet endangered.
migration the instinctive seasonal movement of a population of organisms from one place to another.
habitat the place within an ecosystem where an organism lives.
niche what a species does in its habitat to survive
producer organisms that get energy from the environment.
consumer organisms that get energy by eating other organisms.
symbiosis food or energy.
mutualism a symbiotic relationship in which both partners benefit.
commensalism a symbiotic relationship that benefits one species but does not harm or benefit.
parasitism a symbiotic relationship that benefits one species and harms the other.
Created by: Natalie .
Popular Science sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards