Question

drag each tile to the correct box.

arrange the events in the order they would have occurred according to the theory of endosymbiosis.

both varieties of prokaryotes began living symbiotically

mitochondria and chloroplasts evolved from prokaryotes

large and small prokaryotes existed together

larger prokaryotes engulfed smaller prokaryotes

Explanation:

Identify the initial state of organisms

To establish the correct chronological sequence, we must first identify the starting conditions. According to the endosymbiotic theory, the process began when different types of single-celled organisms lived in the same environment. Therefore, the first event is that large and small prokaryotes existed together.

Describe the engulfment process

Once these different prokaryotes existed together, the next physical interaction occurred. A larger, anaerobic prokaryotic cell engulfed smaller, aerobic or photosynthetic prokaryotic cells (which would eventually become organelles) through a process similar to phagocytosis. Thus, the second event is that larger prokaryotes engulfed smaller prokaryotes.

Establish the symbiotic relationship

After being engulfed, instead of being digested by the host cell, the smaller prokaryotes survived inside the larger host. They began to live in a mutually beneficial relationship, where the host provided protection and nutrients, and the internal cells provided energy. This means the third event is that both varieties of prokaryotes began living symbiotically.

Form specialized organelles

Over millions of years of coevolution, this symbiotic relationship became permanent and obligate. The engulfed smaller prokaryotes lost their independence and evolved into specialized organelles. Consequently, the final event is that mitochondria and chloroplasts evolved from prokaryotes.

Answer:

The correct order of the events according to the theory of endosymbiosis is:

1. large and small prokaryotes existed together
2. larger prokaryotes engulfed smaller prokaryotes
3. both varieties of prokaryotes began living symbiotically
4. mitochondria and chloroplasts evolved from prokaryotes