Question

the diagram below shows a colony of prokaryotes, and a single - celled eukaryote. the eukaryote contains organelles that resemble the three types of bacteria that are found in the prokaryotes. more than a billion years ago, bacteria like these may have joined with prokaryotes to form cells. researchers think that these once free - living prokaryotes became the organelles of the modern - day eukaryotes.

colony of prokaryotes eukaryote

spirochete bacteria
aerobic bacteria
host cell
photosynthetic blue - green bacteria

organelles

which portion of the cell theory does this explain?

all organisms are composed of cells with the same organelles.
all cells come from pre - existing cells.
all cells are made up of bacteria.
all organisms have organelles.

Explanation:

The idea that once - free - living prokaryotes became the organelles of modern - day eukaryotes implies that new cells (eukaryotes) are formed from pre - existing cells (prokaryotes). This relates to the cell theory concept that all cells come from pre - existing cells. The other options are incorrect as not all organisms have the same organelles, not all cells are made up of bacteria, and not all organisms (e.g., prokaryotes) have organelles.

Answer:

All cells come from pre - existing cells.