This perios is known the post-colonist period of galatic civilization. Many species around the outer rim planets of the termanis system, became extinct due to high methane gas levels results in various helth problems.
The disappearance of many species during a relatively short time is known as extinction.
mass extinction
yes
It is index fossils.
approximately more 20 years it will take
Index Fossil
The extinction of a large number of species within a relatively short period of geological time. Caused by some catastrophic global event or widespread environmental change to which species can not adapt
punctuated equilibrium
punctuated equilibrium
Some species of deer will give a short bark, while other species will bellow - especially the stags during the rut.
Relatively speaking, they are considered to be short.
Punctuated equilibria is a theory in evolutionary biology that suggests species undergo long periods of relative stability (stasis) punctuated by sudden and rapid evolutionary change. This theory contrasts with gradualism, which proposes that evolution occurs steadily over long periods of time.
Punctuated equilibrium.
Punctuated equilibrium See link below.