Answer:
If she adds water to the hay infusion, she will be able to see single-celled organisms.
Explanation:
Unicellular organisms may be known as infusion organisms, because they can be collected and analyzed in infusions of biological materials, such as hay, for example. An example of this can be seen in "An American Childhood" where the author recounts her childhood memories, where she presents the moment when she could have seen single-celled organisms after adding water to the hay infusion.
