Water is the obvious answer here, as it is a liquid at room temperature, while hydrogen, methane and helium are all gases. However…
Water
Helium
…we can also say that helium is the odd one out as all the other possible answers contain hydrogen. A level of ambiguity like this can be introduced to your answers in order to facilitate learning and the intake of information.
And the Answer(s)…
Einstein Faraday
NewtonDarwin
Einstein Faraday
NewtonDarwin
3
Einstein Faraday
NewtonDarwin
2
Einstein Faraday
NewtonDarwin
1
Einstein Faraday
NewtonDarwin
Choose now!
Darwin was a biologist, whereas Einstein, Faraday and Newton were all physicists.