Which of the following observation supports the hypothesis that mitochondria evolved before chloroplasts? a. All eukaryotes have mitochondria, but not all eukaryotes have chloroplasts. b. Mitochondria and chloroplasts divide in a way similar to how bacteria reproduce. c. The DNA sequence of mitochondria is similar to the DNA sequence of some aerobic bacteria. d. Mitochondria are similar in size and shape to some bacteria.