Answer: Functional play
Explanation:
Functional play is the playing process that involves playing with toys as per the purpose.It helps the infants to find the intention and sense of world. Playing in a manner to fulfill the purpose involves acts like pushing car toy on floor, rattling a rattler, dressing up dolls etc.It improves the congnitive skill of the children.
According to the question, Robin is involved in functional play in which he is performing the rattling function according to the intention of the rattler.He is interested to perform the same act as he correctly completing the toys objective that make him happy.
This is an example of a "cohort difference."
An cohort study refers to a specific type of longitudinal investigation that example an cohort (a gathering of individuals who share a characterizing trademark, regularly the individuals who encountered a typical occasion in a chose period, for example, birth or graduation), playing out a cross-segment at intervals through time. Hope it helps!
Commercials on T.V are a form of persuasion i think <span />