What is the Capture hypothesis?

The Capture hypothesis proposes that organelles such as mitochondria and chloroplasts were derived from free-living prokaryotes that were engulfed by a host cell but not digested. Over time, these engulfed prokaryotes established a symbiotic relationship with the host cell, eventually becoming permanent residents within the cell. This theory is supported by the presence of prokaryotic-like features in mitochondria and chloroplasts, as well as their own genetic material.