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.
A: An exhaust is the entire system, from the engine cylinder head to the tail pipe. It includes the exhaust manifold, catalytic converter, muffler and all pipes and hardware that connect it to the chassis. A: If you hear noise that gets louder when you accelerate, you may need a new muffler.