I suppose that you thinks to archivistics, diplomatics, linguistics, forensic examination.
medical science.
This is not a branch of agriculture but a branch of medial science.
It would be simple machines
Geography
mechanics?
Physics
The Olive Branch Petition was the document sent to George III.
Nutrition would be the broad field.
Chemistry or physics.
There is no particular branch which deals with extinction, but it would fall under zoology,
biochemistry
Astronomy.