What happens as you push up the balloon?

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

Is tea good for you? if so what type of tea is good for you? and how much should i drink before it is a threat to my health?