Answer:
any of a number of organized or specialized structures within a living cell.
Explanation:
Thanks for letting me help!!
B. The oldest crust is closest to the mid-ocean ridge.
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]
1st stage, also known as the Krebs cycle, also know as the citric acid cycle