Write a paragraph explaining how the human body acts like a zoo, since it harbors organisms in/on it. Support your argument by providing two specific examples of symbiotic relationships that exist between humans and other living creatures.

The great molecular biologist and Nobel laureate Francois Jacob has stated that the human brain has a built-in need for order. From earliest times, human beings looked out and recognized cycles, repetitive patterns in nature—day following night, the seasons, tides, lunar cycles, plant succession, animal migration—that conferred the ability to predict their recurrence, and thus people acquired a semblance of understanding of and control over the cosmic forces impinging on their lives.

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