(a(i))[1]
Sound is produced when a source [BLANK].
(a(ii))[1]
Sound waves are [BLANK] waves.
(a(iii))[1]
Sound waves cannot travel through a [BLANK].
(b(i))[1]
State the lowest frequency of sound that can be heard by mice.
(b(ii))[1]
State the highest frequency of sound that can be heard by elephants.
(b(iii))[2]
Explain how the chart shows that elephants can hear some sounds that humans cannot hear.
(b(iv))[1]
State the term given to the high frequencies that dolphins can hear but humans cannot hear.