How closely related is the Merry Go One Piece manga to the anime?

It's quite close. The One Piece anime mostly adheres to the manga plot, with only a few minor differences.

Yes, they are closely related. The anime is based on the manga and tries to follow its plot and characters closely.

There might not be a direct connection. One Piece is its own standalone manga series with a unique storyline and characters.

Overall, the One Piece anime tries to stay true to the manga. There are some additions and changes made for the sake of animation and to keep the audience engaged, but the core story remains intact.

The One Piece anime is mostly in sync with the manga. But there are some fillers and minor differences here and there.

It varies. Sometimes the anime follows the manga closely, but there can be filler episodes and minor differences.

It follows quite closely. The anime mostly adheres to the manga plot, with just a few minor tweaks for better animation presentation.

It's quite close. The anime of One Piece mostly adheres to the manga, with only a few minor differences.

It's reasonably close. The One Piece anime mostly adheres to the manga plot, with some filler episodes for added entertainment.

Overall, the One Piece anime does a decent job of adhering to the manga. Some arcs might have minor differences in pacing or animation style, but the core story remains intact. Also, they sometimes expand on certain scenes to add more depth.