The main difference between turbojets and rocket engines is the fact that a. turbojets carry their own supply of oxygen as oxidizers. b. turbojets are not dependent on oxygen from the air. c. rocket engines need oxygen from the air. d. rocket engines are not dependent on oxygen from the air.

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