1.Quantitavie: doing an experiment while measuring stuff.
2. I think that is plants ate soil, this experiment would have weighed a lot more than 90.8 kilograms.
3. This hypothesis was wrong because plants don't eat soil.
4. He tried to control the variables by covering the surface of the soil with a metal plate.
5. The weight would have a large difference because it would have been heavier.
6. The soil maybe got stuck to the roots or something.
7. Water molocules really give plants their weight.
8. I would measure the plants every few months because five years is a very long time going with out measuring the plants.
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