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D

Decay

rotting process involving bacteria where nutrients are released from detritus

Decibels

unit for measuring loudness of sound

Degrees Celsius

common unit for temperature measurement

Deposition

when sediments are put down or dropped

Detritus

waste and dead material

Dispersion

splitting light into a spectrum

Domain

small region within a magnetised substance where all the magnetism is in the same direction

Double pump

the right-hand side of the heart pumps blood to the lungs; the left-hand side pumps blood to the rest of the body

digestion

the process by which nutrients from food are broken down and absorbed into  the body.

digestive system

the organs involved in digestion.