When scientists use logic to determine the age of one fossil compared to another what type of dating they use?

What are the two major groups of microorganisms based on whether or not the nuclear material is encased in a membrane? How does chemical reactivity change as you move across the periodic table? Why is the plasma membrane called a unit membrane? What is 7 times 7 times 7 times 7 times 7 times 7 times equal? What are only found in the fovea centralis? What is it called when there is no change in mass? What is a Sengstaken-Blakemore tube? What is general name of fluid form of water? Why does the drop of dew of a plant have a teardrop shape? Which metals shine generally? Who is the person has responsibility and control over the permises and the guests and the activities on the premises? What vegetation do grasslands have? What does a solid state drive do? What two hydrocarbons would be produced by the cracking of hexane? What are major groove and minor groove of DNA? How much water and vinegar do you mix together to get paint out of carpet? What happens when a substance is distilled? What does the acronym Oil RIG stands for in chemistry? Can 30 amp breaker be put in number 12 wire? What is normal value for white blood cells in urine for women?