The derivative of 
is
Definitions:
Extinction Event
A significant, widespread, and rapid decrease in the biodiversity on Earth, often characterized by the disappearance of a large number of species in a relatively short period.
Molecular Phylogeny
The analysis of the evolutionary relationships among organisms using molecular data, such as DNA or protein sequences.
Morphological Phylogeny
The study of the evolutionary relationships among species based on their physical characteristics and structural features.
Marsupials
Mammals characterized by giving birth to partially developed offspring that complete their development in an external pouch.
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