What brain structure produces melatonin?

 Identify the structured indicated by the letter A.

  Which letter indicates the scala vestibule?

Which of the following muscles is NOT involved with chewing?

 Identify the structure at the tip of the arrow.

What is the main action of the muscle at the tip of the arrow?  

Large populations of the southern bark beetle have recently moved into the forests of the Appalachian Mountains. These insects have killed large numbers of pines and severely impacting their ecosystems. This infestation is an example of

__________species are the first to grow in an area following a disturbance that is so severe the landscape is devoid of life.

Which white blood cells comprise 20% to 30% of the circulating WBCs and are the cells that function in the body’s third line of defense against mainly viral infections?

Which isopropyl alcohol is most effective at killing microbes?