What happens to plants when their environment gets over-crowded?
PROBLEM: What happens when a plant population is too dense?
RESEARCH: Look up the word ecosystem in a science textbook.
HYPOTHESIS: What do you think will happen if the plants are too close together? Will there be enough food, water, and sunlight. What else might be in short supply?
MATERIALS:
2 small milk cartons
1 nail
garden [...]
