* No cells: Living things are made up of cells, the basic building blocks of life. Rocks are made of minerals and don't have any cells.

* No metabolism: Living things need to take in energy and use it to grow and reproduce. Rocks don't have any metabolic processes.

* No growth or reproduction: Living things grow and reproduce. Rocks don't grow or reproduce in the way that living organisms do.

* No response to stimuli: Living things react to changes in their environment. Rocks don't respond to stimuli.

While rocks can change over time through weathering and erosion, these changes are not the same as the growth and development seen in living things.