The primary reason for the search is basic curiosity - the same curiosity about the natural world that drives all pure science. We want to know whether we are alone in the Universe. We want to know whether life evolves naturally if given the right conditions, or whether there is something very special about the Earth to have fostered the variety of life forms that we see around us on the planet.

Source : http://www.ieltsg.co...g practice test

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Would you kindly explain "life evolves naturally if given the right conditions, or whether there is something very special about the Earth to have fostered the variety of life forms" ?

Homework help is not intended to mean we do your homework; rather, it means help you do your homework. I'll give you some words and phrases that you can research on the internet, which are related to your question.

Fermi Paradox
astrobiology (alternate exobiology)
abiogenesis
Drake equation
circumstellar habitable zone (also called Goldilocks zone)
extraterrestrial liquid water
Rare Earth hypothesis
exoplanet

BTW: cosmology =
the branch of astronomy that deals with the general structure and evolution of the universe.

Edited November 17, 201312 yr by EdEarl

Thank you so much. first they are not my homework.second I am learning English and need to you help that gradually I will promot.

 

If you do not want to help me, it does not any matter.I will not ask you any questions.

 

Thanks in advance

The source you gave is answered based on interpretation, you have to read the specified documentation and correctly interpret it.