Question

which statement is evidence used to support the endosymbiotic theory?
mitochondria and chloroplasts contain their own dna.
mitochondria and chloroplasts are surrounded by one membrane.
mitochondria and chloroplasts reproduce similar to eukaryotic cells: through mitosis.

Explanation:

The endosymbiotic theory proposes that mitochondria and chloroplasts were once free - living prokaryotes that were engulfed by a larger cell. One of the key pieces of evidence for this theory is that mitochondria and chloroplasts contain their own DNA. This is similar to prokaryotes (which have their own circular DNA), while the nuclear DNA of eukaryotes is linear and organized differently.

Mitochondria and chloroplasts are surrounded by a double - membrane (not one membrane), which could be explained by the engulfing process (the outer membrane from the host cell and the inner membrane from the engulfed prokaryote). Also, mitochondria and chloroplasts reproduce by binary fission (similar to prokaryotes), not by mitosis (which is a eukaryotic cell division process).

Answer:

Mitochondria and chloroplasts contain their own DNA.