Which is an example of a hypothesis that can explain the observation, flashlight does not work?

Why aren't the stains like crystal violet and safranin washed away with water during simple staining?

Which organelles are labeled d, and what is one feature that distinguishes them from the other labeled organelles chloroplasts the only organelles that produce sugars from sunlight mosomes, only found in animal and bacterial cells centricles only found in animal cells mitochondra, the only energo-generating structures found in cells

What are the student's observations and inferences before he starts his investigation?