As does the same exercises on a regular basis, they may find that their heart rate decreases with the same amount of activity, this is because

the muscles have acclimated to the work so now it's not as much work

the heart muscle has become stronger and can pump more blood and oxygen per beat

both a & b

none of the above

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.