a.
4. Antibodies are the types of:
1st line of defense
b. 2nd line of defense
3rd line of defense
d. All

1 thought on “a.<br />4. Antibodies are the types of:<br />1st line of defense<br />b. 2nd line of defense<br />3rd line of defense<br />d. All”

1. Answer:

   c. 3rd line of defense

   Explanation:

   The third line of defense is specific lymphocytes which produces antibodies

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