An experiment in which only one variable is changed is aan)
experiment.

After getting the slide and microscope ready, stella is eager to see the microscopic pond water specimen! she crouches around her microscope and aligns her eye with the microscope’s eyepiece. but she's only able to see a bright white light. at this point, no specimens or cells are visible on stella's pond water slide. after taking a moment to collect her thoughts, stella realizes she can't see any lifeforms because .

What volume of a 0.25 m solution can be made using 0.55 moles of ca(oh)2

Depending on the organism the number of in a cell may change