For a fish to be buoyant, or float, it must displace less water or the same amount of water as its own body mass. ... Many fish use swim bladders to help them with quick depth changes. These bladders fill with air to help fish rise or release air so fish can sink, often in conjunction with forward movement.
Two scientists testing different hypotheses about the same question
Centimeter = 1/100 of a Meter
Kilometer = 1000 Meters
86,000/100 = 860 Meters
860/1000 = 0.86 Kilometers
No se la respuesta talbes pon una foto para que sea más fácil
aquí todos hablan inglés tienes que poner donde dise la materia en spanish/español