"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".
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a handbook of workouts used by elite swimmers
A king inherited the wisdom from his 4 bears
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A beach is a landform alongside a body of water which consists of loose particles. The particles composing a beach are typically made from rock, such as sand, gravel, shingle, pebbles, etc, or biological sources, such as mollusc shells or coralline algae.
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