Some parasites live on the surface of their host.
Ticks are blood sucking parasites that attach to the skin.
Ticks live on the surface of the host.
Where do ticks live?

(a) loose soil
(b) animals
(c) with their fur
(d) In the blood
(e) Behind teeth
(f) On the surface
(g) In the mouth
(h) an organism's body