Which of these terms applies best to all material in this tissue that is not cellular? which of these terms applies best to all material in this tissue that is not cellular? interstitial fluid matrix mesenchyme ground substance?

The answer is extracellular matrix

Extracellular matrix is a term used in biology for molecule outside the cell that has a role in structural or biochemical function. The example would be collagen and elastin, strong and elastic protein that could be found in the skin. These protein is released by a certain cell, so its location is not inside the cell and it is not cellular.