That would be worms. Vibration would be the subject noun, and brings would be the verb. Since the vibration acts upon the worms, worms would be the direct object.
There is no direct object in that sentence.
The verb does not have a direct object in the sentence, "She is insecure."
There is no direct object in that sentence.
There is no direct object in that sentence.
There is no direct object in this sentence.
That sentence does not contain a direct object.
Here is a sentence using the word direct tax.
"song" is the direct object in that sentence.
Personality is the direct object in that sentence.
In the sentence 'you have her a surprise gift', 'her' is an indirect object. 'Gift' is the direct object in that sentence.
Please direct your attention to the display table.
That sentence doesn't contain a direct object.