Some of these definitely need some work on what they'll accept as answers. Look at the percentages on the questions. Those are definitely not due to lack of knowledge. E.g., I knew the force that acts against motion, but I couldn't figure out the exact word-form you require, so I didn't get it on a first pass. (It should accept any form of "friction".) Similar for the floating one (any form of "buoyancy").
And, frogs do NOT breathe through gills (except in the tadpole phase of life, at which time they're not called frogs). After that, they breathe through a combination of lungs, skin, and mouth lining.
2. Einstein was born in Germany, not Austria
Otherwise, good quiz!
Check the accuracy & spelling in the quiz
And, frogs do NOT breathe through gills (except in the tadpole phase of life, at which time they're not called frogs). After that, they breathe through a combination of lungs, skin, and mouth lining.