The student wants to emphasise the similarity between octopus eyes and human eyes. Which choice most effectively uses relevant information from the notes to accomplish this goal?

Question

While researching a topic, a student has taken the following notes:
- Octopus eyes and human eyes each have a lens, an iris and a retina.
- The two evolved independently; the last common ancestor of octopuses and humans, more than 500 million years ago, had only simple light-sensitive patches.
- Unlike the human retina, the octopus retina has no blind spot.

Accepted Answer

A. Although they evolved independently, octopus eyes and human eyes share the same basic parts: a lens, an iris and a retina.. Choice A names the shared structures, which is the similarity, and frames it against the independent evolution that makes it notable.

Answer

B. Unlike the human retina, the octopus retina has no blind spot. — This states a DIFFERENCE between the two eyes.

Answer

C. The last common ancestor of octopuses and humans had only simple light-sensitive patches. — This describes an ancestor's eyes, not a similarity between the two modern eyes.

Answer

D. Octopus eyes evolved more than 500 million years ago. — The notes date the common ancestor, not the octopus eye — and a date isn't a similarity.

Expression of Ideas practice question

Answer: A. Although they evolved independently, octopus eyes and human eyes share the same basic parts: a lens, an iris and a retina.

Why the other answers are wrong

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