Does getting kicked in the balls hurt more than childbirth

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

The amount of oxygen that is actually used by the body during the rest or a hand workout is determined by the heart rate, the stroke volume, and the amount of a. blood circulating in the vascular system b. oxygen removed from the vascular system c. oxygen provided to the vascular system d. blood that individual has in the body e. hemoglobin in the red blood cells

What are three major influences on whether someone starts to use tobacco