The external ear structure is called the Pinna.
The Pinna helps to channel sound waves into the ear.
Many animals have the ability to move their pinna towards the direction of sound.
I have attached an image of a dog's ear to show you the external structure called the Pinna.
I hope this helps! I'm happy to answer any other questions you might have :)
[Image sourced from: https://www.msdvetmanual.com/dog-owners/ear-disorders-of-dogs/ear-structure-and-function-in-dogs]
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Explanation: 3-8
competition plays a very important role in ecology and evolution. The best competitors are the ones who survive and get to pass on their genes.
When the sea floor spreads or collides it creates breakages which would be ocean ridges and deep sea trenches
I had to put the answer in the image sorry