Acarology Agrobiology Study of plant nutrition Study of mites Apiology Arachnology Study of bees Biology Study of spiders Botany Study of living organisms Bryology Study of plants Cardiology Study of mosses and liverworts Marine biology Study of ocean organisms Study of the heart Cytology Study of living cells Ecology Entomology Study of the environment Geology Study of insects Helminthology Study of the Earth’s composition Hematology Study of worms Horticulture Study of blood Ichthyology Study of gardening Immunology Study of the immune system Study of fish Insectology Paleontology Study of insects Study of fossil organisms (including dinosaurs!) Meteorology Oceanography Study of the weather and climate Ornithology Study of the oceans Zoology Study of birds Study of animals