What does indicators mean for science?

Are you wet when you're completely under water or is the water just around you? When was the first inhaler invented? Is stairs a wedge? About how many centimeters equals 8 inches? What where things Benjamin Franklin invented? Describe two uses for the lab reports you write after doing an activity or experiment? How do you use coordination in a sentence? How do sailors navigate the ocean without a compass? What does it mean when your body temperature is 87 degrees? What are the example of plant commensalism? What are the 3 things a hypothesis must have in order to be valid? How do you clean around shower doors? If the wavelength of a red light is 650 nanometers How much bigger is the wavelength of a water wave that measures 2 meters? How can the scientific method prove a hypothesis? How did scientist approach problems during the scientific revolution? Can a 7th grader use how well does a football helmet really protect against impact for a science fair project? Why do things suddenly disappear from when you last remember putting them? Can you bypass limit switch in a Coleman furnice? What is the purpose of using tile cleaners? What is Optical instrument and give the example?