What is the personality trait that pertains to someone who is overly vain and self-absorbed?

Sigmund Freud suggested that quite a bit of our dream content serves the purpose of wish fulfillment

Which of the following statements would be most consistent with the critical thinking concept of falsifiability with regard to Freud's assertion? A) Most dream content is focused on misfortune rather than positive events. B) The dreams of most men are sexual, while the dreams of most women are relational. C) People with brain injuries often dream about "undoing" the event that led to their condition. D) The time we spend dreaming diminishes as we age.

At times, for unknown reasons, a zygote divides into two cells. The result of this is __________

a) dizygotic twins. b) cancer. c) a fetus. d) monozygotic twins.