Giraffes and Elephants: Giraffes have adapted a long neck over time letting them eat and access food allowing them to survive. If a dry season was unusually long they would succeed fine because they are able to eat and drink from the trees. Elephants have survived with similar tactics of eating higher up, they have rough skin allowing them to outlast the heat, and only need water after long periods of time.
The correct answer is true.
Negative staining is often used in diagnostic microscopy and it is the opposite of positive staining where the specimen is stained and background not.
Negative staining is used for the bacteria that are difficult to stain such as Spirilla. It is also used for the study of the morphological shape, size and arrangement of the cells that are too delicate to be heat-fixed.
