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My case study:
Little Susan and her mother were walking along the beach exploring rock pools. Suddenly Susan exclaimed "Mom, mom get over here quick!"
"What's wrong?" her mother asked.
"Nothing," said Susan "I just want to show these two fish in the pool. They look like they could be brother and sister."
"Almost, but not quite." replied her mother.
"What do you mean? They look the same."
"Well," said Susan's mother "if you look at the one, it has those funny slits on the side of its head while the other doesn't. The one also has fleshy fins while the other has fins with spines."
Susan studied the two fish more carefully now and said "So even though they look the same, they have small differences......."
"Spot on!" said Susan's mother
".......almost like dog biscuits look like normal ones but don't taste the same."
"Yes" laughed Susan's mother, "like dog biscuits!"
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