Question

which structure will form when a primitive cell engulfs an aerobic bacterium?
mitochondria
chloroplast
nucleus
cell membrane

Explanation:

According to the end - symbiotic theory, when a primitive cell engulfs an aerobic bacterium, mitochondria are formed. Chloroplasts are formed from the engulfment of photosynthetic bacteria. The nucleus and cell membrane are not formed by engulfing aerobic bacteria.

Answer:

mitochondria