D

Demography: The statistical study of human populations especially with reference to size and density, distribution, and vital statistics

DNA: deoxyribonucleic acid: the chemical at the centre of the cells of living things, which controls the structure and purpose of each cell and carries the genetic information during reproduction

Dominant: The description of a gene in a pair of genes that will produce a particular characteristic, regardless of the characteristic of the paired gene

Double Helix: The shape that two linear strands of DNA assume when bonded together