Save
Upgrade to remove ads
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

Mr. Radeke

Mr. Radeke Chpt. 21 Sec. 2 Life Science

QuestionAnswer
estimate An approximation of a number, based on reasonable assumptions.
birth rate The number of births in a population in a certain amount of time.
immigration Moving into a population
emigration Leaving a population.
population density All the members of one species in a particular area.
limiting factor An environmental factor that prevents a population from increasing.
carrying capacity The largest population that an area can support.
When might an ecologist use indirect observation to estimate a population? Scientists might use indirect observation when apopulation is small or difficult to find.
What are the four methods of determining population size? Direct observation, indirect observation, sampling, mark and recapture
Which method of estimating a population size would you use to determine the number of mushrooms growing on the floor of a large forest? Explain sampling; there would be too many mushrooms over too large an area to count them individual.
Name two ways organisms join a population and two ways organisms leave a population. Join-birth, immigration; leave-death, emigration
Suppose a population of 100 mice has produced 600 young. If 200 mice have died, how many mice are in the population now? (Assume for this question that no mice have moved into or out of the population for other reasons.) 500 mice
Name three limiting factors for populations. Food and water, space, weather
Created by: Tom Radeke
Popular Biology 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