What is the one variable that is changed in the experimental group called? the placebo the independent variable the control group the dependent variable

What type of reaction is zn + cucl2 → cu + zncl2?

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Which description best characterizes the motion of particles in a solid?