Question

Match the immune system line of defense with its correct description.

Answer 1

?

Answer 2

what are the choices?

Answer 3

There are no "description" or anything meaning the question is incomplete.

But, according to Google,

"The human body has three primary lines of defense to fight against foreign invaders, including viruses, bacteria, and fungi. The immune system's three lines of defense include physical and chemical barriers, non-specific innate responses, and specific adaptive responses"