I believe it is the Circulatory system.
I think the absence of light will will stop the leaves from photosynthesis because light is necessary to make plant food.
Please don't copy off this answer. It is just an idea.off
If you need a better explanation just as in the comments.
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Can you provide a picture of the graph?
A pond organism that is unicellular, contains membrane-bound organelles and possesses a flagellum is a PROTISTA. It is a unicellular kingdom.
The Protista kingdom is composed of eukaryotic single-celled unicellular organisms.
Flagellated protists are microorganisms having a tail-like projection known as flagellum.
The flagellum is a structure used for motion, thereby, in general, flagellated protists are found in moist environments (e.g., ponds, fresh-water, etc).
Learn more about the Protista kingdom here:
brainly.com/question/5186929