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.
Answer:
sodium fusion is changed to sodium sulphide if sulphur is present in the compound
Answer:
The temperature is 298.5 K, which corresponds to 0.50°C.
A jacket would be appropriate clothing for this weather.
Explanation: Hope this helps:)
