Question

During a trip to the Galapagos Islands, which observation led Charles Darwin to suspect that organisms change over time? Island finches were able to breed with mainland species. Island finches resembled mainland finches, but were not the same species. Island finches resembled extinct species from other islands around the world. Island finches did not have beaks of the same size and shape.

Answer 1

Answer:

Island finches did not have beaks of the same size and shape

Explanation:

This is  the evidence  of variation,  and therefore proof that  the finches were able to survive  the  selective pressure  by adapting their beaks to different feeds. Therefore finches that were able to adapt  adjusted their beak shapes to the selecting pressure 'feeds' in the environment,  and are naturally selected, and therefore adapted and evolved with time .While those without the surviving  beaks lost out.

Thus  changes in selection pressure, necessitated corresponding  change in the beaks shape  for adaption to survive( due to variation, ) and therefore natural selection   for evolution