Question

select all that apply the endosymbiont theory explains the origin of which two eukaryotic organelles? mitochondrion nucleus golgi body chloroplast endoplasmic reticulum

Explanation:

The endosymbiont theory posits that mitochondria and chloroplasts were once free - living prokaryotes that were engulfed by a larger cell, forming a symbiotic relationship. Mitochondria are thought to have originated from aerobic bacteria, and chloroplasts from photosynthetic cyanobacteria. The other organelles listed do not have their origin explained by this theory.

Answer:

mitochondrion, chloroplast