(a(i))[1]
Identify the chamber of the heart that has the thickest wall.
(a(ii))[1]
State the cause of the heartbeat sound.
(a(iii))[1]
Identify the blood vessel that transports blood from the aorta to the liver.
(a(iv))[1]
State one role of blood plasma.
(b)[3]
Explain how antibodies differ from antibiotics.
(c)[5]
Describe how natural selection has resulted in the evolution of antibiotic-resistant strains of bacteria.