If someone told you they had a career in either ecology, paleontology, or botany, what area of science is this?

Natural Science. Although I don't know whether paleontology counts as a nautral science.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

ok whats the question if not i cannot you i need question and need a thing to answer