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Learning intention: To identify internal and external features of a fish, & to determine what features assist fish to live in the marine environment.
Background:
Fish have the following characteristics:
Slimy, usually scaly skin
Are all poikilothermic- the temperature of their body depends upon the temperature of the environment
Are all aquatic
Fertilisation is usually external, eggs are usually laid, but some bear their young alive
They breathe by means of gills
Paired fins are present
The tail is muscular and forms the main locomotory organ
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