What is a primary role of decomposers in an ecosystem? Select one:
O a. They eliminate matter by taking nitrogen from the ecosystem.
O b. They eliminate matter by taking phosphorus from the ecosystem.
O c. They cycle matter by returning carbon and other matter to the ecosystem.
O d. They cycle matter by returning oxygen and other matter to the ecosystem.

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.