Food
Fictional Characters
Countries
Logos
Science
100
What is oatmeal?
100
Who is Olaf?
100
What is Oman?
100
What is Outlook?
100
a building equipped to view astronomical phenomena
What is observatory?
200
What is omelet?
200
Who is Optimus Prime?
200
What is Oman?
200
What is Olay?
200
mineral that contains metal valuable enough to be mined
What is ore?
300
What are olives?
300
Who is Obi Wan Kenobi?
300
What is Oman?
300
What is Orange Julius?
300
diffusion of molecules through a semipermeable membrane
What is osmosis?
400
What is Okra?
400
Who is Oliver Twist?
400
What is Oman?
400
What is Origin?
400
the loss of electrons during a reaction by a molecule, atom or ion
What is oxidation?
500
/herb-profile-oregano-1761786-5-5c01c4fc1b4d4d748680c261c760497e.jpg)
What is oregano?
500
Who is Old Yeller?
500
What is Oman?
500
What is Oldsmobile?
500
The SI derived unit of electrical resistance.
What is ohm?