TEST 19Road to IELTS 6 · Questions 21–30Experiment Planning FormComplete the form below.Write NO MORE THAN TWO WORDS AND/OR A NUMBER for each answer.Experiment Planning FormExperimental hypothesis:That 21 impacts on crabs at the beach.Variables:Visitor numbersoverall number of visitorsTime of daychanges in number of people and 2223left by visitors to the beachConstants:–floating rubbish–boat pollutionAvailable beaches and usage levels:Main town beach24Beach over the hillLittle use25No use; controlExperimental method:Count crab holes:–over a set 26–in a defined area of sand–the same 27 from the seaEquipment: (3 of each):–measuring tapes, balls of string, small posts–28 to check that we start and stop at the same time–stop watches for timing–29 to see at nightObservations:–Initial time period: one hour / day and night–Total observation period: 20 hours over a 30