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- Walt Whitman

A noiseless patient spider,

I mark'd where on a little promontory it stood isolated,

Mark'd how to explore the vacant vast surrounding,

It launch'd forth filament, filament, filament, out of itself,

...

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noun

A polynomial or function with exactly two variables.

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Chapter 9 of 10

The Tree of Life

1 min read

Darwin's branching diagram showing descent with modification
A branching tree is a useful way to imagine descent with modification.

Chapter 9

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