【单选题】The diagram shows an experiment to investigate photosynthesis. What is the most abundant gas present at the top of the tube at the end of the experiment?
【单选题】The diagram shows an experiment to demonstrate the movement of molecules. After one hour, the water in the beaker turned red. What is the most likely reason for this colour change?
A.
Molecules of red ink move through the membrane by diffusion.
B.
Molecules of red ink move through the membrane by osmosis.
C.
Molecules of water move through the membrane by diffusion.
D.
Molecules of water move through the membrane by osmosis