Which of the following options lists the events of protist evolution in the correct order, according to current science?
A)Mitochondria evolved through primary endosymbiosis; chloroplasts then evolved through secondary endosymbiosis.
B)Mitochondria and then chloroplasts evolved through primary endosymbiosis; later, protozoans were incorporated into several other groups of protists through secondary endosymbiosis.
C)Chloroplasts and then mitochondria evolved through primary endosymbiosis; later, algae were incorporated into several other groups of protists through secondary endosymbiosis.
D)Mitochondria and then chloroplasts evolved through primary endosymbiosis; later, algae were incorporated into several other groups of protists through secondary endosymbiosis.

Question

Quizplus · Accepted Answer

The current scientific understanding of protist evolution is that mitochondria evolved through primary endosymbiosis first, followed by the evolution of chloroplasts through secondary endosymbiosis. Later, algae (which already contained chloroplasts) were incorporated into several other groups of protists through secondary endosymbiosis, leading to the diversity of protist lineages we see today.

Which of the Following Options Lists the Events of Protist