When our most advanced tech was fire, people thought life was like fire, and they were right. Our energy comes from an oxidation reaction.
When our most advanced tech was steam engines, people thought life was like a steam engine, and they were right. Our bodies have a pump at the center that drives them.
When our most advanced tech was computers, people thought life was like a computer, and they were right. Our brains send patterns of electrical impulses through a network.