Nutrition would be the broad field.
Geography
This is not a branch of agriculture but a branch of medial science.
There is no particular branch which deals with extinction, but it would fall under zoology,
The phenomenon of buoyancy would be classified under the category of hydraulics.
That would be under: National Basketball Glaciation.
Life science. Also, biology if you would include that as a branch of science.
I dont know u tell me
medical science.
It would be simple machines
mechanics?
Physics
Chemistry or physics.