Yes they are, especially in dark places but they are more active during the night than the day. <span />
The one that isn’t given the treatment is the control because it allow you to compare the result of when you would add music and when there isnt music
prokaryotic cells do not have a nucleus.
My guess is that fat-soluble toxins that may occur in freshwater ecosystems would most affect apex species in these ecosystems. This is because fat-soluble toxins are stored in the fat reserves of animals, and then bioaccumulate up the food chain. So in this case, most of the toxin is not secreted, but stored within the food chain, and bioaccumulates, with the concentration becoming higher the further up the food chain.