As many as you can imagine. Today scientists usually have their own particular specialization, such as the the evolutiona of insects, and labels can be give to each, such as sociobiological entomology. There are of course broad divisions such as biology, chemistry, and physics, but these are not so much considered fields of study as categories, For example you’ll rarely hear some one say “I’m a biologist;” what they may say is “marine biologist,” “primatologist” (which incidently can also be categorized under anthropology), “ornithologist,” etc.
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