What practical function is provided by the ionosphere? charges atoms
heats oxygen and nitrogen
produces auroras
permits worldwide radio communication

answer: c

explanation:

answerblank(1); ecological; blank(2); evolutionary;

option d : from a warmer substance to a cooler substance

according to second law of thermodynamic, heat flows from higher to lower temperature region. heat is the transfer of energy from an object at higher temperature to an object at a lower temperature. so energy flows from warmer to colder objects.