What is the fastest animal on earth?
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The fastest Animal there is a Cheetah.

The cheetah is the world’s fastest land animal. They can run as fast as a car on the interstate—up to 70 mph. And they can reach that speed in just 3 seconds!

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

the scientific method.