What is the phylogenetic classification system?

Who was the earliest to attempt a more scientific basis for classification? He used simple morphological characters to classify plants into trees,shrubs,and herbs.

Most important criteria used for the present day classification of living organisms is based on

Which scientist classified plants into trees,shrubs and herbs and animals into two groups based on the absence or presence of red blood cells?

Why was there a need for a change in the classification system?

$Statement-1$: Linnaeus classified plants into trees,shrubs,and herbs based on morphological characters.
$Statement-2$: Aristotle divided animals into two groups: $Anaima$ (animals without red blood) and $Enaima$ (animals with red blood).