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
share
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

Biological Evolution

8th Grade Science

QuestionAnswer
diversity The variety of organisms that inhabit the Earth
Extinct A species of organism that no longer exists on Earth
Endangered A species of organism is at high risk of becoming extinct
Variation Difference among individuals in a population
Who is Charles Darwin? British scientist who formulated the theory of evolution by natural selection
What are some factors affecting natural selection? Overproduction, variation, competition, environmental conditions
What is an adaption? These are characteristics that help organisms survive and reproduce in their environment. Includes structures and behavior for finding food, a mate, for protection and for moving from place to place
Behavioral Adaptations Responses made by an organism that help it to survive or reproduce (bears hibernating in the winter)
Structural adaptations Feature of an organism’s body that helps it (penguins blubber to protect from extreme cold)
Physiological adaptations A body process that helps an organism survive/reproduce (snakes produce venom to ward off predator/catch prey
Migration The seasonal movement of animals from one region to another
Camouflage Disguise of an animal’s appearance by blending in to its environment
Hibernation State of inactivity and decreases metabolism for an extended amount of time usually in the winter
Resource Conservation The ability to store fat or water in the body (camel’s hump)
Artificial Size Ability to change size in efforts to ward off predators (puffer fish)
Mimicry The resemblance of one organism to another or to an object in its surroundings for concealment or protection from predators.
What is mutation? Any change in the DNA of an organism
How do mutations occur? Two ways-1) inherited from a parent 2)acquired during a person’s lifetime
How do mutations lead to adaptations? When the mutation that an organism experiences is a positive, and it lives long enough to pas that good attribute on to its offspring, this may become widespread within the population creating an adaptation.
Homologous Structures Similar structures that related species have inherited from a common ancestor. It is a structure that shows how certain species have inherited a function from an ancestor.
Transitional fossils Exhibits traits common to both ancestral group and its descendants
Similarities in DNA Scientist can also compare the DNA to note how many base pairs match up
Embryological evidence Scientist observe the embryonic development of various species of organisms to see if they are related.
Fossil the preserve ed remains or traces of an organism that lived in the past
Sedimentary Rocks Rocks formed from pre-existing rocks called sediment or pieces of once living organisms
What is the only type of rock that fossils can be found? Sedimentary rocks
Half-life The time taken form the radioactivity of specified property to decrease by half of its original value
Radioactive dating Process where scientist look at the half-life of chemicals contained in rocks around a fossil to determine the age of the fossil
Law of Superposition States that each undisturbed rock layer is older than the layer above it.
Weathering The creation of smaller pieces of rock through physical or chemical means
Erosion The moving of sediments from their original position
Compaction & Cementation Process by which sediment is squeezed and glued together into a new rock
True or False: Any type of rock can become another type, given the right conditions. True
Created by: wwturner28
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