How many satellites or robot explored mercury?

When muddy water is allowed to settle is it chemical or physical change? What is the Function of Endosomes? Is it dark or light in antarctica? What kind of deodorant is best for a 12 year old boy? What are laser measuring devices used for? Who is denser white dwarf or a planet? Does two molecules have the same structural formula? How would you describe the key concepts of Ernest Rutherford's model? How many cell divisions does mitosis have and why? Which factors most account for the creation of a tropical climate throughout much of the Indian subcontinent? What type of charge does radium have? How many nautical miles in a time zone? What is genitic engenering? Can you see the northern lights from Arizona? Why do enzymes fall into the protein category? Why do you think these geographic features were important in the early history f china? What carries heat energy around the body? What happened to incomplete proteins that are not immediately needed by the body? Where is there possibility for error in DNA fingerprinting? Can powerful explosive volcanic eruptions result in climatic cooling for millions of years following an eruption?