If you have 85 grams of isotope H-19, which has a have life of 15,000 years. How many years has passed after 5 have lives? How much parent isotope remains after 2 half lives? How many daughter isotopes have been created?.

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food