If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

### Course: Middle school biology - NGSS >Unit 9

Lesson 2: Adaptation and environmental change

# Environmental change and adaptation in Galápagos finches

Adaptation by natural selection is one important process by which species change over time. After an environmental change, traits that support successful survival and reproduction in the new environment become more common; those that do not become less common. Thus, the distribution of traits in a population changes. Created by Sal Khan.

## Want to join the conversation?

• in the 1978 graph why were there so little of the 11.3 beak finches
• There was only one finch born in 1976 (recorded) that had an 11.3 beak depth. The graph exhibits a standard "bell curve", which is used in statistics to display the average of a set of data. Having a beak that large is well outside the average, similar to the way a human 7 feet tall is well above average height for humans
• i want to be bird
• Me too
• There was only one finch born in 1976 (recorded) that had an 11.3 beak depth. The graph exhibits a standard "bell curve", which is used in statistics to display the average of a set of data. Having a beak that large is well outside the average, similar to the way a human 7 feet tall is well above average height for humans
• a good question indeed
• There was only one finch born in 1976 recorded that had an 11.3 beak depth.
• Good notation
• If a species has a shorter lifespan ( and therefore faster results ) will natural selection happen faster?
• Basically. But it's a little tricky depending on the definition of the evolution.
And if they live shorter than another species, it's proven natural selection will occur faster.
• Thanks teacher
• Are adaptation and artificial selection the same thing?
• yes they are the same thing
(1 vote)
• wait. why did Darwin even have to go?
• There werent The graph shows that the average beak size of the finches was increasing over time