The phenomenon of buoyancy would be classified under the category of hydraulics.
Batteries come under Chemistry, which is a subset of Physics.
It falls under physics along with gravity.
The motion of a basketball falls under the heading of kinematics.
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The study of the internal structure of living organisms is called Anatomy, so it is the branch of Biology. Another name of Anatomy is Morphology.
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The study of rocks belongs under the geology branch of science.
gas
This is not a branch of agriculture but a branch of medial science.
Geography
Earth science
Rheumatology.
It falls under Marine Science since ichthyology is the study of fish.
physical and biological
The study of insects.
Organic chemistry
Physics. Most generally speaking, it is physics. As we look into the sub braches it comes under mechanics. Further classified into dynamics. Further into kinetics.