Life Is Made of Partnerships
Human beings like to imagine themselves as separate, self-contained individuals standing apart from nature. Lewis Thomas turns that picture inside out. People are not outside the living world, observing it from a safe distance. We are inside it completely, dependent on it at every moment, and even our own bodies are built from partnerships older than humanity itself.
Inside every human cell are mitochondria, the tiny structures that provide usable energy. They carry their own DNA and resemble ancient bacteria more than they resemble the rest of the cell. Their presence suggests that complex life began when once-independent organisms joined together and stayed together. What seems like a single human body is actually a long successful alliance.
This pattern runs through all life. Plants carry chloroplasts that were once separate organisms. Microbes live in roots, in digestive systems, and inside insects, often doing work their hosts cannot do alone. Some tiny creatures that look like single animals turn out, on closer inspection, to be entire communities moving as one. The closer life is examined, the less convincing the idea of strict biological independence becomes.
That shared structure links all living things. If life began from one early cell, then grass, whales, insects, and humans are relatives at the chemical level. The same basic mechanisms run through everything alive. Thomas reaches toward a larger image from this fact: Earth itself begins to look less like a stage on which life happens and more like a living system whose parts constantly shape and sustain one another.
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