.
Mutation.
Recombination.
Single-gene trait.
Polygenic trait.
Similarities of the birds’ embryos.
Birds’ different-shaped beaks.
Length of the birds’ necks.
Number of eggs in each bird’s nest.
Completely unrelated species on each of the islands.
Species exactly like those found in South America.
Somewhat similar species, with traits that suited their particular environments.
Species completely unrelated to those found in South America.
How species become extinct.
How inherited traits are passed from parent to offspring.
How species change over time.
How evolution takes place in the natural world.
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