Question

the two main categories of

are endocytosis and exocytosis.
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Explanation:

Endocytosis and exocytosis are two main categories of vesicular transport (or bulk transport) in cells. Vesicular transport involves the movement of large molecules or particles across the cell membrane via vesicles. Endocytosis brings substances into the cell, while exocytosis releases substances out of the cell.

Answer:

vesicular transport (or bulk transport)