Scales protect the fish from its environment. They overlap like shingles on a roof so that the skin of the fish is not exposed. As a fish grows, their scales produce rings much like a tree-and that is one way scientists can tell how old a fish is.Most fish get extra protection from a layer of slime that covers their scales. This slime helps them move through the water better, and keeps pests off of the fish skin.s a fish grows, their scales produce rings much like a tree-and that is one way scientists can tell how old a fish is. Most fish get extra protection from a layer of slime that covers their scales. This slime helps them move through the water better, and keeps pests off of the fish skin.
Inside a Muffler. Located inside the muffler is a set of tubes. These tubes are designed to create reflected waves that interfere with each other or cancel each other out. Take a look at the inside of this muffler: The exhaust gases and the sound waves enter through the center tube.
Although it may look like a smaller version of a muffler, resonators are designed to be supplemented into an exhaust system to further tune the sound and not replace a muffler completely. A resonator further dampens the sound but more importantly, it is there to alleviate what is known as âexhaust droneâ. Usually during cruising speeds, some exhaust set-ups may exhibit a background buzz that may be heard even inside the passenger compartment.