You have a sample that has a half-life of 17 years. 1/8 of the sample is the parent isotope. How old is the sample?

How much of the daughter isotope is left?
(not sure of subject sorry)

Look at the figure above. which atmospheric layer has around 80 percent of the mass of the earth's atmosphere? (hint: it's where the clouds seen on earth are formed.) a. exosphere b. troposphere c. stratosphere d. thermosphere

Ascientist is examinin the cell is disrupted when she damages one specific type of macromolecule g the function of macromolecules in a cell she notices that movenent of large molecules into and out of

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel