Dr. Kroeppler wants to record a recommendation on an injection involving an integumentary system protein. If he needs to identify the protein that provides firmness and strength to the skin, he would describe -keratin
-collagen
-elastin
-melanin

David, an aspiring baseball player, was struck on the left side of his face with a fastball pitch. he was not wearing a safety helmet. his zygomatic arch was crushed, as well as parts of the temporal bone. following the accident and reconstructive surgery, he noted that his left lower eyelid was still drooping and the corner of his mouth sagged. what nerve damage did he sustain?

How could you find out if that advice is based in scientific evidence?

What are ways that tobacco use can affect familyand socity