1. Because the string is broken, the soil will dry out, causing the plants to die.
2. The bottom roots touching the gravel will neither continue to grow because they are part of the top plant.
3. The elodea will continue to thrive since the water quality is good.
4. The snails should continue to live for a while because they have a food source (algae?).
Instead of planting two different seeds, I would use one type of seed and mark where they were planted.
Using in the classroom:
For younger students (primary grades)- the whole class would observe 1 ecosystem and observe in a whole class discussion so that the teacher can model how to do scientific processes and correct observations.
For older students, they could observe several ecosystems in groups similar to the way our cohort did. They would create their own observations as well.
Why did the ecosystem turn out the way it did?
-We had clear instructions to follow.
-It was in the same setting the whole time (against the window in the hallway).
-We had about 2 1/2 months to observe the process, making weekly observations.
-Our observations were consistent.