In what ways can you see microscopic organisms responding to stimuli? besides moving

The process of noticing environmental stimuli or stimuli arise from the body is called Sensation; the habit to pay less attention to a non-changing origin of stimulation promote change in responding to sensory events rather than perceiving constant stimulation.  The smallest noticeable difference of the  two stimuli-as stimuli get larger, differences must also become larger to be detected by an observer. 

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

the supermassive black hole is in the middle of the galaxy.