What function do plants have in the forest in the carbon cycle

Will someone me with this.. specialized cells which perform a particular function form: tissues organs or organism

The activity of the modern sample is 1.10 bq . how long does that measurement take?

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