35 month-old Hakeem and 34 month-old Daniel are both in the block area. They are sharing blocks and building a tower together. Hakeem says "here" as he hands a block to Daniel. Both boys say "whoa" as the tower leans, then burst into laughter as it falls. Daniel then says "we do it again." This is an example of ___________________
Cooperative Play
Parallel Play
Solitary Play
Code Mixing
