Medaka fish inhabit rice fields and streams. They are inactive during the winter and active during the summer, which is when their mating season occurs. During the summer, these fish become more brightly colored to attract mates.

Asubstance is held in an open container. its particles move past one another at random speeds but do not leave the container. heat is removed from the system, and the particles slow down. when enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them. when this happens, the substance enters its solid state. the process described above is known as .