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Directions: There is a sentence that is missing in the paragraph below. Look at the paragraph and decide in which blank (option 1, 2, 3, or 4) the following sentence would best fit.

Statement: Depending on the precision with which we can account for these disturbances and the characteristics of the objects involved, the calculations can yield vastly disparate forecasts.

Paragraph: Not even the most advanced physics can reveal everything we want to know about the history and future of the cosmos, or about ourselves. Even if we imagine that humanity will ultimately discover a 'theory of everything' covering all individual particles and forces, that theory's explanatory value for the universe as a whole is likely to be marginal. (1)____. No matter how well we think we know the basic laws of physics and the ever-expanding list of elementary particles, there is not enough computer power in the universe to keep track of them all. (2)____. And we can never know enough to predict reliably what happens when all these particles interact. (3)____. Consider something as simple as, say, Earth's orbit around the sun. Left to its own devices, our world would go on forever in the same orbit. But in time, gravitational nudges from other planets in the solar system can change its course. (4)____. We can never be sure about the future positions of Earth and its cosmic neighbours millions of years from now.

 
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