Here's why:

* Life is a complex system: Living organisms are not just a collection of chemicals; they are highly organized systems with intricate interactions between molecules, cells, and organs. They have the ability to grow, reproduce, respond to stimuli, and maintain homeostasis.

* Chemicals are inert: While chemicals are the building blocks of life, they are inert by themselves. They don't possess the characteristics of living organisms like self-organization, metabolism, or adaptation.

* Emergent properties: The properties of life arise from the complex interactions between chemicals and their organization, not from the individual chemicals themselves.

Think of it this way: you wouldn't say that a brick is a house, even though bricks are used to build houses. Similarly, chemicals are the "bricks" of life, but they don't possess the properties of life on their own.