Discuss the main control mechanism by which temperature homeostasis is Maintained . ( b marks ) Question 5 Best describe the ways desert reptiles conserve water ( 4 marks ) Question 6 compare and contrasts the circulatory systems of grasshoppers , fish and humans ( 10marks ) Question 7 A visit to the neurologist always entails the knee- jerk reaction test as part of the examination why? ( 8 marks)

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