Question

which discovery supported the endosymbiotic theory?
dna in mitochondria
dna in the cell nucleus
dna in ribosomes
dna in the cytoplasm

Explanation:

The endosymbiotic theory proposes that mitochondria and chloroplasts were once free - living prokaryotes that were engulfed by a host cell. The presence of DNA in mitochondria supports this theory as it suggests that mitochondria may have once been independent organisms with their own genetic material. Nucleus, ribosomes, and cytoplasm DNA do not directly support this theory.

Answer:

DNA in mitochondria