The answer is C. The symbiotic relationship has evolved for so many years such that the two are obligate symbiotes and cannot function normally without the other. Chloroplast and mitochondria are believed to have been once free-living bacteria according to endosymbiosis theory.
Age causes the tree bark to darken
A, they use the same bases but in a different order
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The answer is: Chloroplasts.
Chloroplast's main function is to conduct photosynthesis and it's found in plant and algal cells. In photosynthesis the sunlight is transformed into chemical energy, to subsequently produce food for the plant or algal cells and the release of oxygen.
