The correct answer is OC (sound through a door)
How do I know this?
There are four things a wave can do.
1) reflection - this is when a wave hits something and bounces back perfectly.
2) absorption - this is when a wave gets absorbed (it does not come out the other side).
3) transmission - this is what your question is talking about. This is when a wave passes through something and comes out the other side unchanged
4) refraction- this is when a wave passes through something and gets bent
When we hear an echo, this is because a sound wave has been reflected.
When a fish looks larger than it really is, this is because the light wave that allows us to see this fish is bending
When you see yourself in the mirror, this is because light waves are reflected.
Sound is heard through a door, because the sound wave is *transmitted* through the door and comes out the other side. That’s why we can hear it.
Hope that makes sense
The diagram given here describes the process - The alveolus is a part of the lung and assists with gas exchange. The goal is to get gases into and out of the cells, so they enter our body, go to our lungs and then diffuse into our blood and travel to our cells through our circulatory system.
The alveolus or alveoli are tiny air sacs which is a hollow cup-shaped cavity in the lung parenchyma. It functions as the respiratory unit. It helps in gaseous exchange to and from the lungs.
- The gaseous exchange takes place with these sacs.
- Diffusion is the process that takes place in this exchange
- In this process, oxygen moves from a high concentration area to a low concentration that is alveoli to blood capillaries and then circulates to various cells.
- In the case of carbon dioxide, it reaches near the blood capillaries near the alveoli where it diffuses into the lungs through alveoli.
Thus, the correct description is - The alveolus is a part of the lung and assists with gas exchange. The goal is to get gases into and out of the cells, so they enter our body, go to our lungs and then diffuse into our blood and travel to our cells through our circulatory system.
Learn more about diffusion:
brainly.com/question/14392880