They were written by hand on animal skin
Answer:
the answe will be back
Explanation:
I am sorry of it is not right
C. Is incorrect because some cells don’t survive for more than half a century
Sorry idek i just have to answer so i can ask some more hope you find your answer though
Answer:
active immunity
Explanation:
Active immunity is the form of acquired immunity in which the body produces its own antibodies against infections. When infectected by a bacterial infection that had happened before, one will not become seriously ill. This is because memory cells are able to recognise the antigens and stimulate the immune system to produce antibodies against the pathogens.