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To organise into categories or to arrange into groups based one or more attributes or properties.

The brain and spinal cord constitute the central nervous system and are part of the broader nervous system, which also includes the peripheral nervous system.

The result of subtracting one number from another.

A group of reptiles that dominated the land for over 140 million years.

Country in Northern Europe.

The result of subtracting one number from another.

Usually the number of deaths per one thousand people per year.

Slightly wet. 

In genetics, a dominant allele will override the effect of the other allele of that gene. 

Diffraction is the bending of light waves around the corners of an obstacle and spreading of light waves.