Refer to the figure below showing a simplified time line of the origin of life. 
Which event could have occurred between the existence of the "RNA world" and the evolution of the first cells?
Definitions:
Intrinsic Motivation
The drive to perform activities for the inherent satisfaction or pleasure derived from doing the activity itself, rather than for an external reward.
External Reward
Any benefit or reinforcement received from the environment in response to an action, often motivating behavior.
Primary Motivation
The fundamental driving force behind an individual's actions, interests, or goals.
Intrinsic Motivation
The drive to engage in an activity for its own sake, rather than for some external reward or outcome.
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