Its the Chromosomes, if your talking about the human cells.
Animals provide a major avenue for many infectious diseases. Many illnesses that are superbly dangerous such as rabies, avian flu, and ebola, are zoonotic, meaning they infect animals but are then transmitted to humans. It is important that we understand our relationship with animals in order to combat these diseases. <span />
Tracking your flexibility over time as you train. There are no requirements on how flexible you need to be and there is no correlation of your length of life or muscle strength with how flexible you are.