It falls under Marine Science since ichthyology is the study of fish.
Rheumatology.
This is not a branch of agriculture but a branch of medial science.
Organic chemistry
Since tornadoes are a form of weather they fall under study of meteorology.
There is no particular branch which deals with extinction, but it would fall under zoology,
Hurricanes fall under the branch of science known as meteorology. Meteorology is the study of the Earth's atmosphere, weather patterns, and climate. Understanding the formation, behavior, and impact of hurricanes is essential in meteorology.
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Thermodynamics is science that deals with chemical or physical changes due to heat or heat variations.
neurology
Physics, the study of physical phenomena, such as gravity, magnetism, light, electricity, and so on.
executive branch
Judcial Branch