What feature in Google Docs supports team collaboration on long-term projects?

The feature that supports team collaboration on long-term projects is comments and suggestions. This functionality allows team members to leave feedback, ask questions, and provide input directly on the document. By using comments, collaborators can have discussions about specific parts of the text, which helps clarify intentions, resolve ambiguities, and make collective decisions. The suggestions feature further enhances this by allowing team members to propose edits without altering the original content, making it clear what changes are being recommended. This back-and-forth dialogue fosters a collaborative environment, essential for fine-tuning longer projects where multiple perspectives are valuable.

In contrast, while real-time editing enables multiple users to work simultaneously, it doesn't inherently provide context for feedback or discussion. Version history offers a way to track changes over time but does not facilitate direct collaboration during the editing process. Task assignments can help distribute responsibilities but may not directly address ongoing feedback and collaborative decision-making essential in long-term projects. Hence, comments and suggestions stand out as the most effective tool for fostering collaboration throughout the document development.