Complete the sentence to describe the function of the immune system. The main function of the immune system is to provide to the body, which is defined as the body's ability to protect itself from pathogens it is exposed to.

Explanation:

The immune system fight against foreign particles and protects body from outside invaders called foreign particles, such as bacteria, viruses, etc and toxins (chemicals released by microbes).

The immune system is made up of different cells ( like T cells, B cells, NK cells etc) organs (example; thymus) and proteins (complement system) that work together.  

Types of immune system;

Two main type of the immune system are; i) the innate immune system (which we are born with) and  adaptive immune system (The adaptive immune response is antigen-specific ).

your answer is "the 1950's"

the backbone of the dna and rna compound is sugar phosphate.