The answer is Paramecium.
The paramecium is a unicellular ciliated protozoan. They are
often found in fresh water and brackish water areas. They have the elongated
shaped that looks like a rod and has the color violet under the stain because it signifies that it is positive.
Carbon dioxide and water are released as by-products. (A)
It is not Biology ☺so it is math
Definitely C) she did not have enough information to prove her theory to be right.
Just ask a question you have a problem understanding lol