Una característica de los estados de agregación de la materia? Por favor la necesito para un examen

The fact that the total amount of energy in a system remains constant is a(n)

What conclusion can you draw from this experiment about the components of the black ink?

Which activity describes an application of topographic maps? check all that apply. recreation, such as camping and hiking engineering, such as the construction of roads and buildings science, such as mapping stars in the sky business, such as analyzing population centers science, such as analyzing surface features