Which of the following statements about blood vessels is correct?
select one:
a. all blood vessels contain an inner smooth muscle layer.
b. all blood vessels contain a tunica externa.
c. all blood vessels contain a tunica intima.
d. all blood vessels contain an inner connective tissue layer.

Global winds are found in each convection region. because convection cells are in a set place in the atmosphere and the earth is spinning on its axis, the winds appear to curve. the apparent curving of the winds is called a. the coriolis effect b. atmospheric curving c. the curvature effect d. the global wind effect