Students are testing the james river for dissolved-oxygen levels. They test in the blue ridge mountains, at the rivers source, and in Richmond Virginia, a highly populated area. What is the independent variable in this experiment?

Apatient is in need of hydration. which type of solution are the patient's cells most likely in?

Asap i will reward you brainliest for best which sentence about protists is accurate? all protists are unicellular and microscopic in nature. they have organelles, so protists are eukaryotic in nature. all protists make their own energy through photosynthesis.

Which mechanism of transport takes place when solute particles move from a region of high concentration to a region of low concentration? active diffusion isotonic osmosis