Which of these is a difference between a dna and an rna molecule?

!if we removed the wolf, snake, and hawk from this food web, what best explains the impact it would have? a) the number of producers would increase. b)the number of decomposers would increase. c)the number of primary consumers would increase. d)the numbers of primary consumers would decrease.

When water freezes, it . contracts expands

In what for do plants utilize nitrogen? why do they need nitrogen?