Answer: sometimes when somebody is hard on the ATV or mayb runs it alot and drains the battery. The ATV quality may also b changed if it in shut down and turned back on constantly or if the weight limit is exceeded. If the weight limit is exceeded, then it can ruin the motor and than can ruin the starting ability. Also, it could be that in trying to start it, it may have been too cold outside or something to do with the weather affected it.....such as flooding the igniter or starter could have taken place.. That is the best answer I have but there could be alot of different reasons..... hope this helps lol =)
Answer: Bad breath (Halitosis) comes from many things. It can come from poor dental hygiene, oral infections and stomach contents (what you eat). Generally what you eat and how well and how often you brush your teeth will determine what you breath smells like.
Answer: Actually just by looking at the "respiration mechanism" we can understand the forces that can make it possible for us to breath .The most important foce is mechanical force which is done by the contraction and relaxation of the diaphragm (mainly) and the intercostal muscles.