Question

which pieces of evidence support the theory that mitochondria and chloroplasts were once separate cells? (select the three correct answers.) (1 point)
they are surrounded by two separate membranes.
they reproduce by themselves inside the host cell.
they contain their own circular dna, like bacteria.
they lack any of their own genetic material.
they are located inside the nucleus with the cells dna.
they are found in archaea, bacteria, and eukarya.

Explanation:

The endosymbiotic theory posits mitochondria and chloroplasts were once free-living cells. Key evidence includes double membranes (from host and original cell), independent reproduction, and own circular DNA (like bacteria).

Answer:

They are surrounded by two separate membranes., They reproduce by themselves inside the host cell., They contain their own circular DNA, like bacteria.