Thorium-229 is the radioactive substance that gives lantern mantels their eerie glow. The half life of thorium-229 is 7340 years. If one mantel consists of 0.4 grams of thorium, how much thorium will remain after 14,680 years? a.
0.2

b.
0.1

c.
0.05

d.
0.8

Three-carbon molecules of pga are converted to g3p small sugar molecules by calvin cycle, which come from the light reaction.  the  calvin cycle   refers to the light-independent reactions in photosynthesis that take place in three key steps. hope this . have a nice day.