What theory explains how states interpret norms imposed by the international community?

Which of these explains the theory of endosymbiosis?

• This symbiotic relationship provides support for the theory of endosymbiosis, which states that A)animal-like cells evolved from ancestors that were photosynthetic. B)mitochondria and chloroplasts evolved from small prokaryotes living within larger cells. C)photosynthetic organisms, like today's land plants, evolved from photosynthetic bacteria. D)heterotrophic organisms could not have evolved before the evolution of photosynthetic organisms.

• Answer:

  The correct answer is option B The endosymbiotic theory concerns the mitochondria, plastids (e.g. chloroplasts), and possibly other organelles of eukaryotic cells. According to this theory, certain organelles originated as free-living bacteria that were taken inside another cell as endosymbionts. Mitochondria developed from proteobacteria and chloroplasts from cyanobacteria.