What is the process by which stem cells produce exact copies of themselves

Scientific method and data analysisa biology student wanted to determine if there is a relationship between resting heart rate and bodyheight. she gathered information from 12 classmates and constructed the table below. resting heart rate (beats per minute)student height (cm)155. 156156165180180190194195

The body is protected against harmful flu viruses by

What are the formed elements (cell or parts of cell) in blood and what are their functions ?