What is the primary function of decomposers within an ecosystem?

Which experiment would most likely contain experimental bias ?

How much time has elapsed from the very beginning of "the memior of the conquistador bernal diaz del castillo" to the end? a. castillo's whole life b. a quarter of an hour c. a few weeks d. a decade

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water