Biological classification is a dynamic and ever-evolving phenomenon which keeps changing with our understanding of life forms. Justify the statement by taking any two examples.

(N/A) $\rightarrow$ Biological classification is a dynamic process that evolves as our understanding of life forms increases.
$\rightarrow$ Initially, early naturalists like Aristotle, Theophrastus, John Ray, and Linnaeus used simple morphological characters for classification.
$\rightarrow$ For instance, Linnaeus classified plants primarily based on their reproductive organs.
$\rightarrow$ As more scientific knowledge was gathered regarding the structure, cell biology, and evolutionary relationships of organisms, the systems of classification became more natural and complex.
$\rightarrow$ This can be justified by the following examples:
$(i)$ The Two-Kingdom classification system was replaced by the Three-Kingdom system when Ernst Haeckel $(1866)$ proposed the Kingdom Protista to include unicellular organisms.
$(ii)$ Later, the system was expanded to a Four-Kingdom classification by Copeland, who proposed the Kingdom Monera for prokaryotic organisms.
$(iii)$ $R.H. Whittaker$ $(1969)$ further refined this into the Five-Kingdom classification system, which is widely accepted today.
$(iv)$ With advancements in molecular biology and the study of archaebacteria, Carl Woese proposed the Three-Domain system, which further classifies life into Bacteria, Archaea, and Eukarya.