Final answer:
The sentence 'Nora has brown hair and green eyes' is a simple sentence because it expresses one idea in a single main clause.
Step-by-step explanation:
The sentence 'Nora has brown hair and green eyes' is a simple sentence. A simple sentence has one idea expressed in a single main clause. In this sentence, the main clause is 'Nora has brown hair and green eyes', which contains a subject ('Nora') and a predicate ('has brown hair and green eyes').
It is important to note that even though the sentence includes multiple characteristics of Nora ('brown hair' and 'green eyes'), it still remains a simple sentence because it expresses one idea in a single main clause.