How are radioactive isotopes used to determine the absolute age of igneous rock name to radiometric methods that are used

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca