$(a)$ The immune system is essential for our health. Comment on the above statement.
$(b)$ How can we acquire immunity?

(N/A) The immune system acts as a vital defence mechanism that protects our body against pathogenic microbes. It consists of specialized cells and proteins that identify,target,and eliminate infectious agents,thereby maintaining overall health and preventing diseases.
$(b)$ Immunity can be acquired in two primary ways:
$1$. Natural acquisition: When a person suffers from a specific disease once,the body develops memory cells and antibodies against those specific antigens. This provides long-term protection against the same pathogen.
$2$. Artificial acquisition: Vaccines can be administered to introduce weakened or dead pathogens (or their components) into the body. This stimulates the immune system to produce antibodies without causing the actual disease,thereby conferring immunity.