DNA has always been an important factor/key role in the transference of hereditary information. However, Watson and Crick's structure demonstrated the process of how DNA worked on a molecular scale by indicating the way that genes, cells, and ultimately how all life forms reproduce.
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<span>They can rais the number of crops produced in an amount of time, they can also reduce the need for harmful pesticides. However, they may cause more allergies in humans, producing a health risk.</span>
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]