What are the three essential characteristics of experimentation?

Why coastal areas have high humidity? Why do experiments usally test only one variable at time? How tall is 53.5 inches? What is the control group in Redis Experiment? How does a robot know about it's environment? If a car drives 10km across the deck of an ocean liner that is traveling at 90km what is the car's speed relative to the surface of the water when it drives toward the front of the ocean line? What does it mean if something is classified? How many yards of rock will cover 200x10? What is the function of the autonamic nervous system? Sleep is to tired as is to hungry? Do you can live together without laws? How can you tell if a colourless liquid is an acid or an alkali? How does recycling glass reduce littering? why we should wear lab gowns when were in a laboratory? Why does salt water evaporate slower than fresh water? How many pounds is 9.9 kg? How does science empower? When was the aero plane invented? What are three examples of opinion leader? Are places where you might see grapsh?