________ Attention-deficit/hyperactivity disorder (ADHD), which can affect children and adults, is characterized by difficulty in organizing and completing tasks

________ The surface of the eyeball is composed of 13 separate layers

Indicate whether the statement is true or false

Which of the following begins in the flat cells of the epidermis of the face, lips, ears, and the backs of the hands?

a. Osteosarcoma b. Melanoma c. Squamous cell carcinoma d. Rhabdomyosarcoma