Answer:
Sunita will change the variable water.
Explanation:
Sunita have to change the variable water to perform this experiment of diffusion.This is because she is going to predict that more water she uses longer the time needed for the dye to spread through it.
As a result she is increasing the amount of water to observe the effect of diffusible substance on diffusion with time.
He discovered choice C! this is because atoms of the same element can have different numbers of neutrons
Answer:
Protons and neutrons have almost the same mass and are both located in the nucleus of the atom
