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# Long description

Part (a) is a black-and-white ultrasound image of a baby in the womb.

Part (b) is a false colour picture of a house where the chimney and windows are red, showing areas of high heat loss, and the roof is blue, indicating low heat loss (presumably the roof is well insulated).

Part (c) consists of three images of a tooth. On the left is a photograph of the tooth, while on the right are two false colour images showing internal features of the tooth.