The following question refers to this phylogenetic tree, depicting the origins of life and the three domains. Connecting lines indicate instances of gene or genome transfer and time is indicated from left to right. 
A possible phylogenetic tree for the three domains of life.
Which domains have exhibited endosymbiosis?
Definitions:
Self-fulfilling Prophecy
A prediction that directly or indirectly causes itself to become true, due to positive feedback between belief and behavior.
Stereotype Threat
The risk of confirming negative stereotypes about an individual's racial, ethnic, gender, or cultural group that can hinder performance in relevant areas.
Social Comparison
A theory positing that individuals determine their own social and personal worth based on how they stack up against others they perceive as somehow faring better or worse.
Attribution Theory
A theory focused on how people interpret and understand their experiences by ascribing causes to behaviors and events.
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