Would an scientist likely use when measuring the length of a mouse tail?

What reference must you have to measure movement? A biology student is using illustrations of a virus a bacteria an amoeba and a human skin cell to show the relative size of these microscopic objects Which of these is the smallest microscopic obj? Which river run through the London? How many meters are in 60 kilometers? How do littoral zones differ from riparian zones? What is the 7 classification of the Aloe Vera plant? What is the abstract noun for intefere? 3440 grams is how many pounds? Why do you need water for iron to rust? Is Australia moving to Antarctica? How long does marijuana stay in your system naturally for a frequent user? What type of lightning repeatedly starts and breaks? Is a km faster than mph? When a thermometer is quickly dipped in cold water? Where are the noble gases found on the periodic table? How does the temperature affect ice melting with salt and sugar? What are St Helens' eruptions like? Why second ionization energy of sodium is greater than that of magnesium? The government plans to ease regulations on the amount of mercury allowed into the atmosphere even though Mercury has proved to be hazardous to the people and wildlife what might be the governments? How long would it take to see a star explode on earth?