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

9th Bio Chpt 20

9th Grade Honors Biology Chapter 20

TermDefinition
Extinct Condition of a species that has died out and has no living members
Relative dating Method of determining the age of a fossil by comparing its placement with that of fossils in other rock layers
Index fossil Distinctive fossil that is used to compare the relative ages of fossils
Radiometric dating Method for determining the age of a sample from the ratio of a radioactive isotope to the nonradioactive isotope of the same element in a sample
Half-life Length of time required for half of the radioactive atoms in a sample to decay
Geologic time scale Timeline used to represent Earth’s entire history
Era Major division of geologic time; usually divided into two or more periods
Period Division of geologic time into which eras are subdivided
Plate tectonics Geologic processes, such as continental drift, volcanoes, and earthquakes, resulting from plate movement
Macroevolutionary Patterns Changes in anatomy, phylogeny, and behavior that take place in clades larger than a single species
Background extinction Extinction caused by the slow and steady process of natural selection
Mass extinction Event during which many species become extinct during a relatively short period of time
Gradualism Evolution of a species by gradual accumulation of small genetic changes over long periods of time
Punctuated equilibrium Pattern of evolution in which long, stable periods are interrupted by brief periods of more rapid change
Adaptive radiation Process by which a single species or a small group of species evolves into several different forms
Convergent evolution Process by which unrelated organisms independently evolve similarities when adapting to similar environments
Coevolution Process by which two species evolve in response to change in each other over time
Endosymbiosis theory Theory that proposes that eukaryotic cells form a symbiotic relationship among several different prokaryotic cells
Created by: EllyNicole11
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