Biology
Function of pace maker is

To initiate heart beat
To regulate the process of digestion
To start the process of respiration
To regulate the formation of urine

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

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