The endo-symbiotic theory states that ; one piece of evidence supporting this theory is the fact that
a. the first hereditary material was rna . mitochondria and chloroplasts have heredity based on rna.
b. mitochondria and chloroplasts originated as ingested prokaryotes. mitochondria and chloroplasts have their own dna.
c. the genomes of complex animals came in part from the genomes of invading pathogens . the human genome contains the complete genomes of 120 viruses and 10 bacteria.
d. over time, parasites evolve to resemble their hosts. the dna of human parasites contains segments of human dna.

The correct answer is B.

Explanation:

The answer is partly in the name of the theory. The Endosymbiotic Theory, endo meaning "to absorb" or "to contain" and symbiotic meaning "a mutually relationship between two bodies in which both mutully benefit from" or "close physical interaction between two organisms".

The theory suggests that at some point in time, a prokaryotic cell was consumed by another cell which eventually led to the development of organelles such as mitochondria and chloroplast. The strongest evidence for this statement is the fact that these organelles have their own DNA, which can be an indication to the fact that once they were seperate organisms.

I hope this answer helps.

true is the final answer!