18. Which activity is not a response of human white blood cells to pathogens? 1. producing antibodies
2. identifying invaders to be destroyed
3. removing carbon dioxide
4. engulfing and destroying bacteria

The answer is option 3.

Explanation:

White blood cells are not responsible for removing carbon dioxide.

White blood cells contain lymphocytes and phagocytes.

Lymphocytes produce antibodies to attack pathogens while phagocytes engulf pathogens.

the answer to your question is:

c. complementary base-pairing

the answer is: metamorphic rocks often show the presence of fossils, also a

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-lavira: )