What resource(s) did you have to replenish in the terrarium? were the resources biotic or abiotic? what would happen if you had not replaced those resources?

1. water-to sustain condensation in the glass wall and to prevent wilting.

2,the layer of soil inside should be well mixed or replenished  to  reduce loss of microorganisms or to prevent microbia damages and  to maintain good growing conditions.  

They are abiotic or non-living  resources,        

if these resources  were not replenish-  no water would be available from condensation of evaporated water from the soil in the terrarium, and the plant will wither

If the soil is not mixed aeration will be poor,  microorganisms will die,and good growing conditions will  not be provided for growth.

Generally  a saleable glass container or open glass container which  contain plants growing on a layer of soil , which can be accessible for maintenance is called Terrarium.

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i believe your answer would be c.. : )