drug dependence occurs when the user develops a drug tolerance in conjunction with unpleasant withdrawal symptoms when use of the drug is discontinued, whereas drug dependence occurs when the user has a craving or irresistible urge for the drug's pleasurable effects.

Physical drug dependence; Psychological drug dependence

Explanation:

Physical dependence is brought about when a tolerance-forming drug is used and as a result of the brain adapting and tolerating the effects of the drugs, an individual will require a constant use of such drugs to sustain the positive effect of the drugs. An attempt to withdraw from using the drug will spring up withdrawal symptoms that make one feel physically sick, which may include having nausea, seizures etc.

In the case of psychological dependence, a withdrawal from the use of the drug would initiate withdrawal symptoms that are emotional rather than physiological. One tends to have the persistent cravings and urge to continue usage. Withdrawal symptoms might include anxiety, anhedonia etc.

no, because those are both different running competitions. while distance runners train their legs and their lungs to run long amounts of time, the sprinters are training their legs and their lungs to give all they have in the little amount of area they need to cover. the brain also plays a huge part in all of this.

the brain is the only thing in your body that sends messages to your body telling you to run. if you are a long distance runner and you have the mind set of a sprinter, you will not get anywhere. if you have a long distance mind set and you have to run 200m in 20 seconds then you will not make it in time.