los murcielagos se orientan en la oscuridad emitiendo ondas de ultrasonido que, al relajarse con los objetos, le proveen informacion sobre su ubicacion¿ porque usan ondas de frecuencia muy altas?

What are chlorofluorocarbons and what impact do they have on the atmosphere?

Which of the following describes how a microwave heats food

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.