Aim on how does the dominant hand and non-dominant hand react to stimulus

The dominant hand will most probably be faster to react and will also react more strongly in comparison to the non-dominant hand. The reason for this is that our dominant hand tends to be better at reacting towards stimuli in comparison to our non-dominant hand. 

How they differently handle their team- hagrid a champion explains this better than me

There are  advantages  to being  multicellular  rather than unicellular. these include allowing: the  organism  to be larger.