What themometer do you use to check a two year old

Charlie is easily winded during soccer practice and wants to improve his cardiorespiratory fitness. which activity would be best for him to choose? lifting weights walking from one class to another running in a 5k race riding a bike at a leisurely pace

Which of these might cause a conflict because of how a person was raised

During polarizacion potassium has a blank charge sodium has a blank charge and calcium has a blank charge