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[Music] hi and welcome back to three science lessons Kole you K by the end of this video you should be able to describe how to measure the population size of a common species in a habitat you should then be able to describe how to use sampling techniques to investigate the effect of a factor on the distribution of this species and this is required practical so its important that you learn all the details were going to start by estimating the total population of daisies in a field like this one to do that were going to use random sampling and we looked at that in the last video remember that in random sampling we use a quadrat like this one quadrats come in a range of different sizes were going to use one thats not point five meters by null point five meters first we place two tape measures at right angles these tape measures should be 20 meters in length we dont need two bags and each bar contains the numbers 1 to 20 in this practical students work in groups of three the first s
