Gradualism vs Punctuated Equilibrium

Gradualism is 

• big changes over time

• small changes over time

• small changes in a short amount of time

Punctuated Equilibrium is

• Small gradual changes over a long period of time

• Short period of tine with no changes then long period of time with lots of changes

• Long period of time with no change then a short period of time with big changes

What is believed to cause 

Catastrophism?

• Natural disasters that cause sudden changes in the ecosystem followed by fast changes in species (evolution)

• Natural disasters cause changes in populations of species 

Which theory do scientists think is accurate?

• Gradualism

• Punctuated Equilibrium

• Neither one is thought to be accurate

• Both are thought to be accurate

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