Misc: To what great civilization/empire do we owe our custom of 60 minutes in an hour?

Questions

Anthropoid (ape) of equatorial Africa that, physically & genetically, is the animal most closely related to humans?

Any animal lacking a vertebral column, or backbone?

Any comparatively small body of land completely surrounded by water?

Any free-moving liquid in outer space will form itself into a sphere, because of it's surface ______?

Any material that hardens & becomes strongly adhesive after application in plastic form?