The part of the thyroid that connects the two halves is called the:

Applying the principles of Poiseuille's law, which statement is true?

a. The resistance offered by a tube is in-versely proportional to its length. b. As the radius of a tube decreases, the pressure gradient increases. c. The more viscous the fluid, the easier it is to move the fluid through a tube. d. The driving pressure of a gas is indirectly proportional with the length of the tube.

A specific defense against a certain bacterium is known as the body's:

A. lymphatic vessel B. immunity C. chemical attack D. immune response