Heart Or The Blood, Which Came First?

If my blood came first what pumped it around? If my heart came first what did it do? It seems really logical and provable in a lab that life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life begets life did it start? does it end? life seems to be timeless