Which is a defining characteristic that all protobionts had in common?

Question

Quizplus · Accepted Answer

The defining characteristic that all protobionts had in common was the presence of a surrounding membrane or membrane-like structure. This allowed for separation from the external environment and the formation of a self-contained, semi-permeable system able to regulate internal conditions. The other options listed may have been present in some protobionts, but were not universal traits.

Which Is a Defining Characteristic That All Protobionts Had in Common