Asked by darren

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A scientist was observing a unicellular organism over a period of time. He noticed that vacuoles kept moving to the same place in the plasma membrane to empty their contents outside the cell.

The organism he was observing was
a euglena
.

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Answered by GPT-5 mini AI
a euglena

Euglena (a freshwater unicellular protist) uses contractile vacuoles that periodically move to the membrane and expel excess water to maintain osmotic balance.