In space, rockets move by shooting air backwards. What moves faster the air or the ship?

Who was the first scientist to measure speed as distance over time?

Both independent and dependent clauses

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions