PLEASE HELP ME Iodine 131 has a half-life of about 8 days.

A. How long will it take for the radiation of the isotope to go from 100 g to 12.5 g?

B. If a sample of iodine 131 weighed 200 grams initially, how much mass would be remaining after 32 days?

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

the answer is b: 1.4 km/hr

the answer is: metamorphic rocks often show the presence of fossils, also a

hope i

-lavira: )

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.