One good option is tetrameter.
Answer:
The first sentence has an idiom: over the moon
Explanation:
Both the second and 3rd sentence do not contain figurative language
the 4th sentence contains a simile not an idiom
Answer:
What leads up to the problem
Explanation:
<span>help scientists understand perceptual principles</span>
Answer:
Did you see your_principal__on the way to school?(principle,principal)