7.
[Junior school science (biology)]
Drugs that make people sleep or relieve pain are
11.
[Junior school science (biology)]
Which class of animals feed on plants only?
18.
[Junior school science (physics)]
37.
[Junior school science (biology)]
Which non-metal is used for disinfecting water?
43.
[Junior school science (physics)]
how many planet do we have in our solar system