Answer:
The exogenous pathway occurs when MHC class II molecules present fragments derived from extracellular (exogenous) proteins that are located within the cell. First, pathogens are phagocytized, then endosomes within the cell break down antigens with proteases, which then combine with MHC II.
Explanation:
Just walk out and if you end up getting in trouble tell them you really needed to go and couldn't wait anymore.
They provide energy to the body kind of like gas to a car