55 lbs. or less. 55 kg or less. Less than 55 lbs. 

Remote Pilot in Command (Remote PIC). Person manipulating the controls. Visual observer.

Denial of an application for a period of up to 1 year or suspension/revocation of a remote pilot certificate.   Up to 1 year in jail. A fine up to $10,000.

visual observer. remote pilot-in-command.  owner of the small UAS.

Remote Pilot in Command. Commercial Balloon pilot. Designated Pilot Examiner.

600 feet AGL. 500 feet AGL. 400 feet AGL.

No, Part 107 requires a Remote Pilot certificate. Yes, as a Student Pilot they can. Yes, under the direct supervision of a remote Pilot in Command.