What are the two differences between the normal mole and the mole that has developed melanoma?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Which of the following statements about protists are true? a.they are typically found in moist environments. b.they are all unicellular. c.they have a nucleus. d.they are all multicellular.

Which genetic disorders, caused by an extra x chromosome (xxy), is characterized by a lack of testicular development in males, effeminate features, possible mental impairment, and a thin stature?