1. A pulmonary artery carries blood from a. the right ventricle to the lung.
b. the lung to the left atrium.
c. one lung to the other.
d. the pulmonary vein to the heart.

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.

answer; ///progressive relaxation;