We got 2 bottles in each group and cut off the top off one and bottom of the other and put one inside the other. We added water to the bottle.
We added a lid which had string through it, so that the string could carry the water up into the soil that we also added.
We poked holes in the soil and added mint seeds and put on a small amount of water.
The used the discarded top section to cover out biomes to offer protection but still allow sunlight through.
We are waiting to see if anything grows and will keep you updated!