Biology, 19.03.2020 02:09 tonio638

In an experiment, a culture of Euglena is placed in a petri dish, and a piece of cardboard with a circle cut
out of its center is placed over the petri dish, allowing light to enter only the center of the petri dish.
After 30 minutes, the cardboard is removed, and the culture is observed.
Which of the following BEST describes the appearance of the Euglena culture after the 30 minutes?

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