How will the tree population change if ALL other organisms (deer bears and mushroom) are removed from forest?

The tree population would likely increase. Deer and bears browse on tree seedlings and saplings, preventing them from growing into mature trees. Mushrooms also compete with trees for nutrients and water. With all other organisms removed, the tree population would have less competition and would be able to grow more easily. However, the ecosystem as a whole would be negatively impacted, as the loss of deer, bears, and mushrooms would disrupt the food chain and nutrient cycle.