Which organ produces the hormone adrenaline that prepares the body for fight or flight response?

Which everyday chemical process explains why sliced apples turn brown after being exposed to air?

Which layer of the atmosphere contains the ozone layer that absorbs harmful ultraviolet radiation?

Which photoreceptor cells in the eye are responsible for colour vision and function best in bright light?

Which everyday observation shows that hot air rises and cool air sinks creating circulation?

Which gas is responsible for the characteristic smell often associated with rain after a dry spell?