The following table shows the 200 most popular given names for male and female babies born during 2000 - 2009. For each rank and sex, the table shows the name and the number of occurrences of that name.
Endosymbiont theory is the idea that eukaryote cells arose in evolution by the fusion of previously free-living protists (prokaryotes).p143 The theory was first suggested by the Russian botanist Mereshkovsky in 1905.
Because they evolved without them. Bacteria are a type of prokaryote. All prokaryotes lack membrane bound organelles. This is due to its evolutionary history. It is generally accepted that eukaryotes evolved after prokaryotes, thus membrane bound organelles were not the norm. The most commonly proposed idea, the endosymbiotic theory, suggests that eukaryotes were formed by endocytosis. That is, larger cells would consume smaller cells.