Number 3.

But why is it number 3bcan you explain? Thx

It says ‘a bright star shaped patch of light

The answer is 3 because u can see a star shape at sheet R so it is definitely opaque, then u can cross out the one that is wrong. If there is a star shape, that means the first sheet is transparent which allows light to pass through entirely. So you also can cross out the one that os wrong and you will get the answer 3. Use analaysing method it works for all MCQ questions. Hope you underhstand

Thanks so much

Describe the difference between the young of a beetle and the young of a cockroach.

The young of the beetle does not resembles the adult however the young of the cockroach which is the nymp resembles the adult. (Resembles means looks like)