Question

on a trip to the galápagos islands, charles darwin noticed that tortoises on grassy islands tended to have round shells and short necks, while tortoises on islands without much grass had notched shells and long necks. what new scientific knowledge came from darwin’s interpretation of these differences?
tortoises are plant eaters.
the neck length of a tortoise determines its shell shape.
tortoises with short necks prefer to eat grass, while those with long necks prefer to eat taller plants.
species can evolve to fill specific niches.

Explanation:

Darwin's observations on Galápagos tortoises relate to natural selection and adaptation. The idea that species evolve to fill specific niches (adapting to their environment's resources, like food availability) aligns with evolutionary theory. Other options describe diet preferences, shell - neck relationships, or basic feeding habits, not the key evolutionary insight from these differences.

Answer:

Species can evolve to fill specific niches.