1. Diffusion: Random movement of molecule/ ion or gases from a region of higher concentration to lower concentration.
2. Dermatology: Study of skin.
3. Dendrochronology: Counting and analysing annual growth rings of tree to know it’s age .
4. Ecology : Study of inter-relationship between living and their environment.
5. Evolution : Study of origin of life, variation and formation of new species.
6. Embryology : Study of fertilization of egg , formation of zygote and development of embryo.
7. Eugenics : Study of factors connected with the improvement of human race .
8. Euthenics: Study of environmental condition that contribute to the improvement of human beings.
9. Euphenics : Treatment of defective in heredity through genetics engineering.
10. Ethnology : Study of science dealing with different races of human.
11. Ethology : Study of animals behaviour in their natured habitats.
12. Etiology: Study of causative agent of disease.
13. Entomology : Study of insects.
14. Exobiology : Study of possibility of life in space.
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