Since you didn't have any extra information about the question I'll be presenting an example from my own textbooks that I've used.
An example of a direct observation is listening to a cricket chirp at night, and counting the number of chirps per minute.
Direct Observation is where the evaulator watches the subject in their usual habitat without disrupting or altering it.
Its<span> a nuclear process used for determining the concentrations of elements in a cast amount of materials.</span>
Dang that’s crazy.. Goodluck ..
Benzene is the compound name and it is a covalent compound
The substance has a higher density than water
