Examlex
The basic rhythm of the heartbeat is set by the ______.
Identical Twins
Twins who develop from a single fertilized egg that splits in two, creating two genetically identical organisms.
Fraternal Twins
Twins who develop from separate fertilized eggs. They are genetically no closer than brothers and sisters, but they share a fetal environment.
Neuroticism
A personality trait characterized by moodiness, anxiety, and emotional instability.
Extraversion
A personality trait that is characterized by outgoingness, high energy, and sociability.
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