B: Antigens
Explanation: Antigens itself are the invaders that causes an infection or a disease in living organism. They do not protect against invaders in non-specific response as they themselves are the ones who are invading the body.
Digestive enzymes are the enzymes that act on a particular substrate for its action at a particular PH.
Stomach acid is the hydrochloric acid that keeps the PH of the stomach low and prevents the growth of unwanted pathogens.
Lysosomes have digestive enzymes in it. It performs the process of phagocytosis.
The appropriate response is vestigial. Identifying with a body part that has turned out to be little and lost its utilization as a result of transformative change. Whales, for instance, have little bones situated in the muscles of their body dividers that are minimal bones of hips and rear appendages.
SMOOTH ENDOPLASMIC RETICULUM synthesize lipids and steroids, metabolize carbohydrates and steroids
ROUGH ENDOPLASMIC RETICULUM synthesizes proteins .<span>
</span>
