<span>The heart has two receiving chambers (the right and left atria) and two outgoing chambers (the right and left ventricles).</span>
Exotic species do not have a niche in the ecosystem that they are in. Therefore they take up resources that native species rely on to survive. Exotic species also have no natural predators in that environment causing them to flourish and multiply quickly.
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]
I believe the correct answer from the choices listed above is option D. <span>This is an example of cellular organization. Cells organize themselves according to their functions. Hope this answers the question. Have a nice day.</span>