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.

Explanation:

Darwin noticed finch beak variations on the Galapagos. These variations suggested adaptation to different food sources and environments, indicating evolutionary change over time.

Answer:

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