16Hit1600
Expression of IdeasMediumExplaining the reason for a phenomenon

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - Flamingos are born with grey feathers. - Their diet of algae and small crustaceans contains pigments called carotenoids. - The birds' bodies deposit these pigments in their feathers. - Flamingos in zoos fed a pigment-free diet turn pale.

The student wants to explain why flamingos are pink. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Flamingos hatch grey and turn pink because pigments from the algae and crustaceans they eat are deposited in their feathers — a zoo flamingo on a pigment-free diet turns pale.Correct
  2. B. Flamingos are born grey.
  3. C. Flamingos eat algae.
  4. D. Zoos sometimes keep flamingos.

Answer: A. Flamingos hatch grey and turn pink because pigments from the algae and crustaceans they eat are deposited in their feathers — a zoo flamingo on a pigment-free diet turns pale.

Grey at birth, pigments from food, and the zoo evidence: the reason.

Why the other answers are wrong

B. Flamingos are born grey.
The starting point without the reason for change.
C. Flamingos eat algae.
The diet without the pigment link.
D. Zoos sometimes keep flamingos.
Irrelevant.

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