Answer:
The correct answer is -
Involves cells such as neutrophils and macrophages
First line of defense, and
Responds to every foreign invader the same way.
Explanation:
Innate immunity is the first line of the immune system however it is not specific defense mechanism which comes immediately in the action to the appearance in the body.
These mechanism involves physiological barriers like skin, involves chemicals in the blood, immune system cells such as neutrophils and macrophages that help in fighting against invaders.
Thus, the correct answer is -
Involves cells such as neutrophils and macrophages
First line of defense, and
Responds to every foreign invader the same way.