Determine the proper ordering of the sentences to form a logical paragraph:

(P) This selective pressure favored individuals possessing vocal apparatuses capable of varied phonetic articulation.
(Q) Early hominids initially communicated through basic somatic gestures and uninflected vocalizations.
(R) Over successive millennia, complex cooperative hunting necessitated more nuanced acoustic coordination.

Answer and explanation

Correct answer: B. Q — R — P

  1. Step 1: Identify the opening chronological anchor: sentence (Q) establishes the baseline ancestral state of communication ("initially communicated through basic somatic gestures...").
  2. Step 2: Trace the evolutionary progression: sentence (R) introduces the environmental development ("Over successive millennia, complex cooperative hunting necessitated..."), which generated an adaptive demand. Sentence (P) refers back to this demand via the demonstrative phrase "This selective pressure favored...", completing the coherent sequence Q — R — P.
Answer
Q — R — P.
Why not the others: P — Q — R starts with "This selective pressure", which lacks an antecedent; R — P — Q leaves the introductory statement about early hominids hanging at the end; Q — P — R places "This selective pressure" before the cooperative hunting pressure has been mentioned.

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