The grouping of objects or events based on similar characteristics is called
observation
interpretation
measurement
classification
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The sorting of objects or events based on similar characteristics is called as Classification.

Option D

Explanation:

As the population of living species is very high, they are classified under different categories based upon the similarities exhibited by then through process called as classification or taxonomy. Such type of processing is required in order to rule of the difficulties arising during the research. The organisms are classified under seven titles namely:

(1) Kingdom

(2) Phylum or Division

(3) Class

(4) Order

(5) Family

(6) Genus

(7) Species

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex