What is a young lady in a binkini I pictures help me understand the must :)

Iwill give brainliest if you answer right : )

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

Due in 40 explain in terms of frame of reference if you’re inside a moving train everything on the outside can seem to be moving