Over the past century, several scientists around the world have made the following observations: New mitochondria and plastids c
an only be generated by old mitochondria and plastids through a process similar to binary fission. Both mitochondria and plastids contain DNA that is similar in shape and size to that of bacteria. Mitochondria and plastids are surrounded by two or more membranes whose composition is similar to a prokaryotic cell membrane. Mitochondria and plastids are about the size as bacteria. These observations led scientists to conclude that
That this an endosymbiotic relation
that has evolved over long time that has made the relationship now obligatory.
These organelles represent formerly free-living prokaryotes taken one inside
the other in endosymbiosis, around 1.5 billion years ago. According to the theory, bacteria received shelter from the protist cell while it generated
energy for use by the protist cell.
The circulatory system would fail, and the entire organism would suffer.
------i took the test and at first i chose what the person above me said which was A, but i got it wrong. when i looked at the "review" to see which ones i got wrong, it showed that the correct answer is C.
