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III. Reconstruct the following text using the words from the box to fill in the blanks. What do you think about extraterrestrial life?

The existence of extraterrestrial life is currently (1)____; there is as yet no (2)____ of life outside the planet Earth that has been widely accepted by scientists. Most scientists hold that if extraterrestrial life exists, its evolution would have (3)____ independently in different places in the (4)____. An (5)____ hypothesis, held by a minority, is (6)____, which suggests that life in the universe could have (7)____ from a single initial point of origin, and then spread across the universe, from habitable planet to habitable planet. These two hypotheses are not mutually (8)____.

All life on Earth is based on the building block element (9)____ with water as the (10)____ in which bio-chemical reactions take place. Given their relative (11)____ and usefulness in (12)____ life it has long been assumed that life forms elsewhere in the universe will also (13)____ these basic components. However, other elements and solvents might be (14)____ of providing a basis for life. Silicon is usually (15)____ the most likely alternative to carbon, though this remains improbable. Silicon life forms are proposed to have a crystalline (16)____, and are theorized to be able to exist in high (17)____, such as planets closer to the sun. Life forms based in ammonia rather than water are also considered, though less (18)____. Nor can the possibility be (19)____ that a completely new (20)____ may be found that may react in a similar way to carbon or that wholly (21)____, non-chemical life-forms may (22)____ flourish through exotic physics.

Along with a building block (23)____ and a solvent, life also requires an energy (24)____. Energy from a parent (25)____ is the most obvious source for extraterrestrial life but this is not the only possibility, as the example of (26)____ extremophiles shows. Geothermal energy from a planet's (27)____, for instance, may drive sub-surface or oceanic life, while tidal flexing (e.g., for bodies (28)____ a gas giant) provides another possible (29)____ to sustain living (30)____.

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