Actions speak louder than words means talking about something isn't going to make it better, you should take action so it helps solve the problem. I wouldn't say it talks about proving anything wrong based on the definition.
Answer:
1.
an exchange of diverging or opposite views, typically a heated or angry one.
2.
a reason or set of reasons given with the aim of persuading others that an action or idea is right or wrong.
The function of the noun phrase <em>Green, leafy vegetables </em>in this sentence is that of the subject of the sentence.
What contains important vitamins for a healthy body? - Green, leafy vegetables.
