Biology
Antigen is a substance which

Destroys harmful bacteria
Triggers the immune system
Lowers body temperature
Is used as an antidote to poison

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Biology
The main function of the inner bark of a woody plant is to

Transport food from the leaves to the other parts of the plant
Act as a membrane impermeable to water and gas
Transport minerals and water from the roots to the leaves
Protect the plant from herbivorous animals

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