Since it is a theory, it can not be determined if it is in fact true. There are some who believe it and some who do not believe it.
true
theory of evolution
theory
The subtle differences between the beaks of Galapagos finches, and their distribution over the different islands helped Darwin to formulate his theory of Natural Selection. We know that this is true because it is constantly observable in the world around us.
Somehow some people believe in his theory but most people believes in creation theory
Lynn Margulis ;)
The Endosymbiotic theory of Lynn Margulis.
This is the endosymbiotic theory.
Lynn Margulis first proposed the theory of endosymbiosis.
Eukaryotes
Endosymbiotic theory describes that.It shows photosynthetic and aerobic bacteria engulfed by eulariyotic cells turned into chloroplst and mitochondria.
The Endosymbiotic Theory is a theory about how mitochondria and chloroplasts formed. The theory suggests that both the mitochondria and chloroplasts were once prokaryotic cells that were ingested but not digested by eukaryotic cells. This would explain why both have their own DNA.
Chloroplasts and mitochondria according to the endosymbiotic theory.
endosymbiotic theory
Endosymbiotic Theory
Mitochondria and chloroplasts are thought to have originated as prokaryotic endosymbionts: True
Mitochondria and chloroplasts reproduce independently from the cell.