Explain why an ecologist must consider both speciation and extinction when analyzing diversity of life on earth.

An ecologist must consider both of the speciation and extinction of an organism or when analyzing the diversity the life on earth because of the following reasons;

-          It is a role of an ecologist

-          It is part of their job

-          This will tell the existence of the organism

-          The organism’s life span on earth

-          How it was existed and were extinct

not sure if this is what you'r looking for eubacteria and archaebacteria