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From other subjects, there is no penalty for using pen. the reason you use pencil is to avoid excessive messiness if you need to change it :)

Absorbing salt from the environment is the role of the gills. Water constantly moves INTO the fish as it is freshwater and so there is a higher concentration of water outside and via osmosis it moves inside. Kidney then reabsorbs less water and excretes most Source: kidneys - "A primary...