Identify the part that contains an error.
Marine vertebrates are / valuable for / many reasons.

Correct option is B

There is no grammatical or contextual error in this sentence.
· "Marine vertebrates are" – This is a grammatically correct subject-verb structure.
· "valuable for" – The phrase "valuable for" is correctly used to indicate usefulness or importance.
· "many reasons" – The phrase "many reasons" correctly conveys that marine vertebrates have multiple important aspects.
✅ Correct sentence:
"Marine vertebrates are valuable for many reasons."
Thus, the correct answer is (b) No error.