Were humans supposed to get this or was it a mistake?

Why did david smith burnish the surface of his work cubi xix?

The protects the ear, collects sounds, and channels them to the middle ear a middle ear b ear drum' c front ear d outer ear

Which sentence contains a comma splice? marco rode to school on his bicycle this morning, he arrived an hour early.marco, who enjoys riding his bicycle to school, arrived just before the bell today.marco rode to school on his bicycle on monday, tuesday, and wednesday.marco, who rode to school on his bicycle this morning, arrived an hour early.mark this and returnsave and exit