the usage of as in this sentence??

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Dear Sir or Madam,

i feel confused about the usage of as in the following sentence:

As it will be illustrated several times throughout this volume, models can used to test the hypothesis of ecosystem behavior such as the principle of maximum power presented by H.T. Odum (1983), the ascendancy propositions presented by Ulanowicz (1986), the various proposed thermodynamic principles of ecosystems, and the many hypothesis of ecosystem stability.

In this sentence, what is the usage of "as"? and what does it refer to ?

Thank you in advance!

grammar asked May 07 at 03:54 stefan New member

2 answers


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As is a conjunction. 

As it will be illustrated several times throughout this volume, models can used to test the hypothesis of ecosystem behavior such as: the principle of maximum power presented by H.T. Odum (1983), the ascendancy propositions presented by Ulanowicz (1986), the various proposed thermodynamic principles of ecosystems, and the many hypotheses of ecosystem stability.

link comment answered May 07 at 07:25 Sanjay Contributor
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thank you so much. but what does the word "it" refer to ? models? or others?

link comment answered May 07 at 07:48 stefan New member

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