When surface fires occur, they release valuable plant nutrients that had been tied up in slowly decomposing litter and undergrowth. true / false.

True

Explanation:

Surface fires have several ecological benefits such as

a)They only burn litter and other flammable waste materials and prevent huge forest fires.

b)The important minerals that are held within the litter are released which would have otherwise remained within the slowly decomposing waste

c)It prevents several diseased and promotes the growth and development of certain trees.  

d)It also releases seeds and thus causes sprinting after fire thereby preserving habitat for animals.

Hence, the given statement is true

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.