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.
We do not share your email address with others. It is only used to allow you to reset your password. For details read 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.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
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 18.19,20

interdependence how organisms interact with other organisms in their surroundings
biosphere the Earth and all the life that includes it
biotic factors factors that classify organisms as living
abiotic factors factors that classify organisms as non living
tolerance curve a graph that measures the performance of temperature, and environmental variables
acclimation organisms raising their tolerance to abiotic factors
dormancy a longer term strategy of animals entering a state of reduced activity
chemosynthesis use energy stored in inorganic molecules to create carbohydrates
gross primary productivity the rate in which producers in an ecosystem capture the energy from sunlight by producing organic compounds
biomass the organic material that has been produced in an ecosystem
net primary productivity the rate at which biomass accumulates
detrivores consumers that feed on garbage/waste in the ecosystem
trophic level determines the organism's position in the sequence of energy transfers
transpiration the process of water leaving from plants in ecosystems
nitrogen fixation the process of converting N2 gas to nitrate
nitrogen-fixing bacteria the process of transforming nitrogen gas into a usable form
ammonification when soil becomes ammonium
dentrification how nitrogen is returned to the atmosphere
dispersion spatial distribution of individuals
age structure the distribution of age between people of different ages
survivorship curve the probability that members of a population will survive to a certain age
logistical model population growth that also accounts for certain factors
density independent factors natural disasters
density dependent factors shortages of resources
demographic transition how population changes happen model
interspecific competition the type of interaction in which two or more organisms use the same limited resources
species richness the number of species in a community
species eveness the relative abundance of each species
species area effect the theory that smaller places contain more of the species than larger
ecological succesion the gradual growth of a community of a species
primary succesion the development of life in a community that has not supported life before
secondary succesion the replacement of a species after a disaster
pioneer species the organisms that predominant early in succession
climax community the description of succession that a community proceeds through a predictable series of stages until it reaches a stable point
Created by: elizrhys



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:
restart all cards