Beak of the Finch (Transcript)

What is the main focus of researchers studying the origin of species in the Galápagos Islands?

• The migration patterns of sea turtles

• The diversity and origin of finches

• The behavior of marine iguanas

• The formation of volcanic rocks

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How long have Peter and Rosemary Grant been studying the Galápagos finches as of the revised date in March 2018?

• Over 50 years

• Over 20 years

• Over 40 years

• Over 30 years

What significant observation did the Grants make about the finches during the drought of 1977?

• Finches changed their diet to insects

• Finches with smaller beaks survived better

• Finches with larger beaks had a survival advantage

• Finches migrated to other islands

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What did DNA evidence reveal about the finches of the Galápagos?

• They are unrelated to each other

• They all come from a single common ancestor

• They are more related to mainland species

• Each island has its unique species unrelated to others

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What role do songs play in the differentiation of finch species according to the Grants' research?

• Songs keep different species from mating

• Songs are irrelevant to species differentiation

• Songs help in finding food

• Songs are used to scare predators

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What was the effect of the unusually strong El Niño in 1983 on the finches?

• It led to an increase in large beak finches

• It caused many finches to migrate

• It favored finches with smaller beaks

• It had no significant impact on the finches

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How did the Grants measure evolution in the finches?

• By observing their migration patterns

• By measuring beak size changes over generations

• By tracking their mating songs

• By studying their genetic mutations

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What crucial insight into adaptation did the Grants gain from their study?

• Beak size adaptation to food availability

• Finches adapt by changing their feather colors

• Finches can change their beak size within a lifetime

• Finches adapt their songs to attract mates

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What keeps different species of finches from mating, according to the Grants?

• Geographical barriers

• Differences in beak size

• Differences in songs and appearance

• Preference for different foods

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What general insight does the history of the Galápagos finches offer?

• Isolation leads to extinction

• Diverse environments promote the formation of new species

• Species cannot change once they have evolved

• All finches are essentially the same

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