an astronomer, - Studies the planets, stars, and galaxies., a botanist, - Studies plant life., achemist, - Studies chemistry and the behavior, properties, and composition of matter., a cytologist, - Studies cells., an ecologist, - Studies the relationship between living organisms and the environment., an entomologist, - Studies insects., a geneticist, - Studies genes, DNA, and the hereditary characteristics of living organisms., a geologist, - Studies the properties of matter that makes up Earth as well as the forces that shaped it., a marine biologist, Studies the living organisms that live in the ocean and other bodies of water., a microbiologist, - Studies microscopic life forms such as bacteria and protists., a meteorologist, - Studies the Earth's atmosphere including the weather., a nuclear physicist, - Studies the interactions and make up of the atom., an ornithologist, - Studies birds., a paleontologist, - Studies prehistoric life and fossils including dinosaurs., a pathologist, - Studies diseases caused by pathogens such as bacteria and viruses., a seismologist, - Studies earthquakes and the movements of the Earth's crust., a zoologist, - Studies animals.

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