I present to you a simple argument I’ve heard before.

Everything humans do can be explained as a combination of behaviors they exhibit. These behaviors in turn are caused by the interaction of various systems in the body such as the endocrine, nervous, and reproductive systems. These systems function due to the interaction of the cells which form them. Cellular physiology is determined by a set of biochemical pathways which respond to stimuli from the environment. These biochemical pathways have certain kinetics and thermodynamics which can be elucidated by chemistry. Chemistry is just applied physics.

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