Fish use density in order to move in the water since they do not have lungs. When the density of water keeps changing, fish use it to move and thereby using less energy.
No, fish gills do not move when they are dead. When a fish dies, its gills stop functioning, as they require the fish to be alive in order to extract oxygen from the water through the process of respiration.
To control general attitude/level in the water, fish have a "swim bladder" in order to move they have muscles and fins.
a long fish.
they move like a games
The speed at which objects travel through water depends on various factors such as the size and shape of the object, the density of the water, and any external forces acting on the object. Generally, objects move slower in water compared to in air due to the higher density and viscosity of water. Some objects, like fish and boats, can move relatively fast through water, while others, like rocks, may hardly move at all.
Fish swim in order to move from place to place for whatever reason they choose.
cosmic task of a fish is to move the water
They move their arms slowly.
Cold air decreases water density because colder temperatures cause water molecules to move closer together, resulting in increased density. Conversely, warm air causes water molecules to expand and move farther apart, leading to decreased water density.
The density of a fish is much smaller than the density of water, therefore the fish does not sink, but it should float. The only thing that keeps the fish from floating to the surface are their swim bladders. They are organs inside the fish that contain gas to balance out the density of the fish and make the fish achieve neutral buoyancy and stay in the water.
they usually eat insects, fish, frogs ans small water birds
Density is due to the amount of atoms in given space (grams per cubic centimeter). When we cool water, the water molecules move closer together (and more slowly) leading to an increase in density in cold water. When we heat water, they gain energy and move farther apart (and move faster), lowering the density of the water.