It's not A or B because neither have any effect on air pollution. Air conditioners or heaters just change the temperature of the air by filling the room in. Products being reused or disposed makes no difference on air, although it can make a big impact on whether the environment stays green so to speak.
The answer is C.
Hazardous waste are different. They are dangerous, suffocating, and irritating. They are pretty much chemicals that people should be careful of using. It's even worse if it's not disposed of properly. The name hazardous itself explains the danger. It is something that can pollute the environment if not taken care of properly.
Energy balance refers to the relationship of energy intake to energy expenditure.
Answer:
C) Shared rules of conduct that tell people how to act in specific situations
Arrhythmia is the irregularity of heartbeats. A heart should beat just like seconds hand of a clock. Those who are the victims of arrhythmia experience fast or slow heartbeats very often. Some times arrhythmia don't cause any problem. They don't need any specific treatment. Some Arrhythmia is serious. A child with serious Arrhythmia needs a regular checkup. It is hard for such a child to participate in some sports activities. A child with serious arrhythmia may need medicines, Some regular test, radiofrequency ablation, a device or surgery.
