Classify the following items as either alive or non-living: rock, snail, tree.
- Rock is non-living.
- Snail is alive.
- Tree is alive.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following items as either alive or non-living: rock, snail, tree.

### Output:
- Rock is non-living.
- Snail is alive.
- Tree is alive.