The last universal common ancestor (LUCA) was most likely a blank, containing a cytoplasm surrounded by a lipid bilayer membrane, but with no nucleus.

Prokaryotic

Explanation:

That one cell is called the Last Universal Common Ancestor, or LUCA. It probably existed around 3.5 billion years ago. LUCA was one of the earliest prokaryotic cells. It would have lacked a nucleus and other membrane-bound organelles.

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