Which of these systems fight against the invading micro-organisms?
A
Immune system
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B
Digestive system
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C
Nervous system
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D
Excretory system
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Solution
The correct option is A Immune system We have a system called immune system to fight against the invading micro-organisms. The immune system has various components like cellular components (white blood cells) and molecular components (antibodies). Various types of white blood cells are present in the blood.