You examine a cell by electron microscopy and find a molecule on the outside of the cell and in vesicles in the cytoplasm. the most likely explanation is that this substance moved into the cell

Osmosis

Explanation:

Osmosis absolutely explains

- how substances from the cell surroundings enter its cytoplasm THROUGH its semi-permeable membrane known as cell membrane

- and also enters its vesicles like vacuoles, which are bound by membrane.

So, osmosis is the answer

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