"of insects" is an adjective phrase because it's a prepositional phrase that acts as an adjective. It modifies the word "group"; In other words, "of insects" is used to describe the word "group".
Answer:
The country's modern history began with the Spanish conquest of Guatemala in 1524. Most of the great Classic-era (250 – 900 AD) Maya cities of the Petén Basin region, in the northern lowlands, had been abandoned by the year 1000 AD.
Explanation:
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You haven't specified the forms of poetry.