Question

endosymbiosis refers to the:
presence of a double membrane around the nucleus.
internal movement of structures within cells along the cytoskeleton.
proposed prokaryotic origin of certain eukaryotic organelles.
presence of dna in the nucleus of eukaryotic cells.
process by which cells ingest molecules and target them to lysosomes for digestion.
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Explanation:

Endosymbiosis theory states that eukaryotic organelles like mitochondria and chloroplasts evolved from engulfed prokaryotic cells that formed a symbiotic relationship with the host cell. This matches the description of the proposed prokaryotic origin of certain eukaryotic organelles. Other options describe unrelated cellular features (double nuclear membrane, cytoskeletal movement, nuclear DNA, endocytosis/lysosomal digestion).

Answer:

proposed prokaryotic origin of certain eukaryotic organelles.