Only the fittest survive. ______ wild populations have numerous traits for competitiveness, resistance to parasites,

Correct — A, Consequently. The first sentence gives a cause ('only the fittest survive'); the second states its result — because only the fit survive, the surviving wild populations therefore carry fitness traits. A sentence-initial adverbial connector that joins two full sentences and marks a result is 'Consequently', which fits both the logic and the grammar (it opens an independent clause).

Why the others are wrong

• (b)
  Inadvertently — 'Inadvertently' means by accident or unintentionally, but these traits are the deliberate outcome of selection, not an accident.
• (c)
  Although — 'Although' is a subordinating conjunction of concession; it needs a contrast and would leave a dependent clause without a matching main clause, so it fits neither the result logic nor the grammar.
• (d)
  Since — 'Since' introduces a subordinate cause-clause ('Since wild populations have ... traits'), leaving the sentence with no main clause, and it reverses the cause-effect order the passage sets up.

Cloze / linker item: the first sentence is the cause ('only the fittest survive') and the blank must introduce its consequence, cued by the result connector 'Consequently'.

No directly related past PYQ was found.

• practice — not a real PYQ

  Fill in the blank: He trained hard for months. ______, he won the race with ease.

  • (a)Nevertheless
  • (b)Consequently
  • (c)However
  • (d)Meanwhile
  Answer(b) Consequently — the win is the result of the months of training.
• practice — not a real PYQ

  Choose the correct linker: The bridge was declared unsafe. ______, all traffic was diverted.

  • (a)Consequently
  • (b)Although
  • (c)Otherwise
  • (d)Meanwhile
  Answer(a) Consequently — the diversion is the result of the bridge being unsafe.