Which of the following true statements best supports the endosymbiotic theory?
select one:
a. all mitochondria have circular dna.
b. all eukaryotic cells have ribosomes.
c. all eukaryotic cells have dna.
d. all mitochondria function as powerhouses to the cell.

Many organizations release indexes used to measure the development of the world's countries. as we learned in this lesson, these indexes measure many factors, from life expectancy to happiness. in your opinion, what are the three most important factors we can use to determine how developed a country might be? explain your answers in a few sentences.