Little tunny is a fish found in the Atlantic Ocean. The photograph shows a little tunny. (Source: © Picture Partners/Alamy Stock Photo) A student wanted to compare the heart of this fish with the heart of a mammal. The student planned to cut open the fish and remove its heart and to keep the heart in a liquid preservative called formalin. The student made a risk assessment before the dissection. The diagram shows part of a safety datasheet about formalin. HARMFUL Harmful by inhalation, in contact with the skin or if swallowed. Irritating to eyes, respiratory system and skin. Limited evidence of a carcinogenic effect. May cause sensitisation by skin contact. The student put the risk assessment into a table. Complete the table to show one hazard for the dissection and one for the preservation of the heart. (4)

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