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

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.