The P wave of an ECG is produced by the ______.

Which of the following describes a way that some birds can navigate on an overcast night with solid cloud cover?

__________ contain nearly 60% of the total blood volume and are considered as storage areas for blood.

The three branches off of the aorta that supply blood to the upper limbs and head are the ______.

Five hypothetical forest communities, each have one hundred individuals distributed among four different tree species (W, X, Y, and Z). Which of the following combinations of species in a forest community would make it the most diverse?

The _________ is the maximum volume of air that can be forcefully exhaled after a maximum forceful inspiration.

The ____________ is(are) referred to as the pacemaker of the heart.

The artery carrying blood from the abdominal aorta to most of the small intestine is the ______.

Which of the following WBCs typically makes up 40–60% of all WBCs?

Which cranial nerve mediates the sense of smell?