Here's why:

* Double membrane: Chloroplasts have an outer and inner membrane, similar to mitochondria.

* Contains DNA: Chloroplasts have their own DNA, separate from the cell's nuclear DNA. This is evidence of their evolutionary origin as once independent bacteria.

* Converts inorganic compounds into organic with the use of light energy: This is the process of photosynthesis. Chloroplasts use sunlight, water, and carbon dioxide to produce glucose (a sugar) and oxygen.

Let me know if you have any other questions!