John is taking a bus to school. he sits in the third row behind the driver and places his book bag under his feet. he then looks out the window as the bus travels its route. the bus stops and picks up additional passengers. a woman in a blue shirt with a baby sits in the seat next to john. when the bus arrives at school john takes his bag and exits the bus. later that day he sees a woman in a blue shirt and thinks that she resembles the woman on the bus. why did john remember the color of the woman's shirt

he probably paid attention to the woman in the blue shirt provided she was also sitting next to him.

Explanation:

As we spend time looking at a person or an object which captures our interest or which is just there Infront of us for a longer period of time it is very likely that this get restored in our memory quickly than something we would observe only for a split of second and which passes quickly before we get a chance to record it in our memory.

He had all the time to look at this woman since she was sitting next to him which made it so easy to record it without even realising in his memory.

i believe its the Mississippi river!