Answer:
Cytoplasm is the answer
Explanation:
Cytoplasm is a thick solution that fills each cell and is enclosed by the cell membrane. It is mainly composed of water, salts, and proteins. In eukaryotic cells, the cytoplasm includes all of the material inside the cell and outside of the nucleus.
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To design an experiment, you must set all other variables constant. These may include the environment, soil type, plant/flower type, water treatment and other essential variables. The only parameter you should vary is the soil temperature.