During its lifetime, a male cichlid fish can switch back and forth between dominant and subordinate social roles. The switch most importantly depends upon ____.

A) distribution of oxytocin receptors
B) water temperature
C) food availability
D) the presence of a larger dominant male
E) the presence of fertile females

Oxytocin Receptors

Proteins located on the surface of cells that bind oxytocin, a hormone involved in a variety of processes including labor, social bonding, and stress reduction.

Dominant Male

The member of a male-dominated society or group who has the highest rank, strength, or power.

Fertile Females

Female individuals of reproductive age who are capable of conceiving and bearing offspring.