Please provide more information in your question
Well, in the U.S textbooks, we use a system of 6 kingoms while in other textbooks like Great Britain, they have 5. (Britain isn't the only place with 5)
Based on the information I have no clue either
The correct answer is the evolution of multicellular life. The evolution of multicellular was the most important event happened during the creation of the ozone layer. All of type of the organisms had evolved over time.
The theory of endosymbiosis states that the eukaryotic cells evolved from the prokaryotic cells. According to this theory, a large bacterium ingested a small bacterium and then they evolved together working as a single unit. This can be shown through a model by demonstrating a big bacteria ingesting the small one. The small bacteria came to be cell organelles, such as mitochondria and chloroplasts in the eukaryotic cells with their own DNA.
Correct: show the big bacteria ingesting the small one