The immune system has both specific and nonspecific immune responses against pathogens. Which scenario describes a specific immune response? the body using intact skin to keep out all pathogens
o antibodies being produced to fight off a pathogen inside the body
macrophages engulfing an unknown virus that has entered the body
inflammation and redness occurring at the site of a bacterial infection

antibodies being produced to fight off a pathogen inside the body

Explanation:

Specific immune responses, also known as the adaptive immune system are ways the body fights against pathogens. The body is able to identify cells that are unique to it. When pathogens bearing an unknown identity enter the body, antibodies are released to attack the antigens on the surface of these pathogens.

The body usually develops this immunity after a previous attack by the pathogen. Lymphocytes known as the B and T cells are released by the immune system t engulf the pathogens.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.