1. Moving swiftly
   "fast-flying planes"
   - flying

See also: moving

• bioremediation
• biorhythm
• BIOS
• biosafety
• biosafety level
• biosafety level 1
• biosafety level 2
• biosafety level 3
• biosafety level 4
• bioscience
• bioscope
• biosecurity
• biosphere
• biostatistics
• biosynthesis
• biosynthetic
• biosystematic
• biosystematics
• biosystematy
• biota
• biotech
• biotechnological
• biotechnology
• bioterrorism
• biotic