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Notice the peg-like protrusions coming out all around the pollen grain. These assist the pollen to attach themselves to pollinators (insects, birds, etc.) which transfer pollen from flower to flower (pollination)
This is the pollen grain of a hibiscus flower.
You may have noticed the colored pollen grain in the picture. SEMs (Scanning Electron Microscopes) cannot take color pictures because they do not use light (as a regular microscope would), but instead they use electrons. This photograph was artificially colorized to highlight the object of interest: the pollen grain.