Is running in place a type of stretch !

Which term defines one's age as measured in years? chronological age biological age social age mental age

Ireally need to know this answer asap

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