Answer:
Many animals and people take up residence in places and structures vacated by others, illustrating a phenomenon that economists and sociologists call a "vacancy chain."
Explanation:
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1. The reason Romans invaded and conquered Britan was its abundance of natural resources, especially metal. The author clearly states this as he also states that Britons did mine the metals but not really efficiently. They did not have the technology to exploit the mines to their full potential. Romans with their technology were able to do just that.
2. For Romans, of course this meant that they can now produce the things they needed on much larger scale thanks to the resources provided by their newly conquered territory. Thus as the text states, they used the resources to craft metal coins, tools and numerous weapons that would be used all over the Roman Empire.
Yet as an adverb. Yet is an adverb that refers to a period of time that begins in the past and ends in the present. In the present perfect, we mostly use it in negative statements or questions.
Using "Yet" as an Adverb To describe something that hasn't happened yet, use the word "yet." It is frequently used in negative statements where a negative term such as "have not" or "has not" is used, such as "I haven't completed my homework yet," or "I haven't eaten breakfast yet."
They are typically placed prior to the main verb but after auxiliary verbs (such as be, have, may, & must). Only when the main verb is "to be" does the adverb come after the main verb.
To learn more on adverb
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<span>he is envious of him because he gets to play soccer.</span>
