Here's why:

* No cells: Rocks are not made up of cells, which are the basic building blocks of all living organisms.

* No metabolism: Rocks don't take in nutrients, convert energy, or produce waste like living things do.

* No growth: Rocks don't grow or develop on their own. They might change shape due to erosion or weathering, but this is not the same as biological growth.

* No reproduction: Rocks can't reproduce or create offspring.

* No response to stimuli: Rocks don't react to changes in their environment like living things do.

While rocks are fascinating and can change over time, they lack the fundamental characteristics of life.