Hello Anagha,
Every organisation demands people from almost all sectors to carry out its work in efficient and productive manner.
Thus, for becoming a scientist u need to get confused with the field to choose as you may definitely become a scientist by choosing any of the above mentioned fields.
All you need to do is analyse your interest and creativity in any one field in which you can be best and go for it. Doing things out of interest may cause you trouble later.
GOOD LUCK
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