Dan drinks a cup or two of strong coffee in the morning to him wake up and get rid of his sleepiness. according to the in focus box: what you really want to know about sleep, the common stimulant drug in coffee, caffeine, blocks receptors for a naturally occurring compound in the body called thus promoting wakefulness.

Adenosine.

Explanation:

Adenosine is a neurotransmitter that is created in the brain and when it binds to the adenosine receptors, it slows down nerve activity and it creates a sensation of drowsiness.

Caffeine looks like adenosine to the receptors, therefore, when we have caffeine, it binds to these receptors and there is no room left for the adenosine to bind. However, the caffeine doesn't slow down nerve activity but, in the contrary, it speeds it up.

Therefore we can tell that caffeine blocks the receptors for the adenosine thus promoting wakefulness.

answer

ben’s food poisoning was caused by cross-contamination

explanation

cross-contamination in food occurs when harmful bacteria is transferred to food from other foods, utensils or cutting boards. it happens often when handling raw meat , sea foods and poultry. in this case, because ben did not wash hands before and after handing the poultry, chances that bacteria transfer   from the poultry to the vegetable are high.