https://www.youtube.com/watch?v=sLP8dcnWnJg Biology: Required Practical 3 1 2 3 What is this required practical about? ................................................................................................................................................. There are three tests above. Complete the grid to summarise them. Test Testing for Reagent (chemical used to test) Positive result 1 2 3 What is the biggest source of error in these experiments? ................................................................................................................................................. ................................................................................................................................................. Think about how you carried out practical 1. Write a logical and comprehensive method, using numbered bullet points. Is your method good? Read it. If someone else could get results from it then yes!