Which Piece of Evidence Did Darwin Observe During His 5-Year

question 29

Multiple Choice

Which piece of evidence did Darwin observe during his 5-year journey aboard the HMS Beagle?

• A) A South American species of finch is most likely the ancestor of the Galápagos Island finches.
• B) Species do not change over time.
• C) The environment can change the phenotype of an organism and this is heritable.
• D) All species share the same basic genetic blueprint.
• E) The earth is approximately 4.6 billion years old.

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Definitions:

Difference Threshold

The minimum difference in stimulation that a person can detect 50% of the time, also known as the just noticeable difference (JND).

Sensory Adaptation

The process by which sensory receptors become less sensitive to constant stimuli, allowing individuals to adapt to their environment.

Top-Down Processing

A cognitive process that starts with the brain applying what it knows and expects to perceive and interpret new information.

The Fovea

A tiny pit located in the macula of the retina that provides the clearest vision of all; it's responsible for sharp central vision.