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even though it says identify..its better to hav a good knowledge of it cos they can throw in 8 marks questions since u can use a lot of examples for each, especially for the first defence barrier question

theres only one organ of corti "a few for different frequencies of sound" different frequencies are detected by different hair cells in the organ of corti..their just at opposing ends.... high frequency sounds are detected at the front of the organ of corti ner the oval window and low...

Bio Questions "you have carried out first-hand investigations that have attempted to model biological conepts. discuss the use and limitations to moldels when illustating biological concepts." With this questions, the only investigations i remember are modelling natural selection and...