(a(i))[1]
Define the term pathogen.
(a(ii))[2]
State two ways a pathogen can be transmitted.
(a(iii))[2]
Complete Table 4.1 by giving examples of the body’s defences.
(b(i))[3]
Describe how they do this.
(b(ii))[1]
State one way modern medicine can support the body’s defence against pathogens.