The correct answer is: the treated glioblastoma cells were cultured in the presence of an inhibitor from umbilical cord stem cells, but the control cells were cultured without the inhibitor.
It has been shown that treatment with injected umbilical cord stem cells has strong therapeutic effects on glioma models. Those cells produce anti-tumour substances, with inhibitory effects.
Control group does not include the treatment in order to observe the treatment.
The answer to this is C because humans don't have cell walls and if you are looking at an onion it has a cell wall because it is a plant.
By performing controlled experiment that are tested by gathering more data based on observations
Im not sure but if there was a graph maybe
