An important key to good observational records is
a. the use of language.
b. the activity of the subject.
c. their length.
d. appropriate format.

The answer is letter A. An important key to a good observational records is the use of language. The most known type of observational records that uses the language is narrative recording which focuses all behaviors during the time of recording or observing.

White dwarf is very hot, but also very small and that is why it may appear dim.